Title of Invention

A CARDING MACHINE FOR PROCESSING FIBER MATERIAL

Abstract

A carding machine for processing fiber material, said carding machine comprising a machine frame and a main drum disposed within said frame to receive fiber material; a set of moving flats disposed relative to said main drum to clean and open fiber material carried by said main drum, said flats comprising individual clothing elements protruding from a base member; a grinding apparatus disposed relative to said set of moving flats, said grinding apparatus comprising a plurality of grinding elements extending from a support member that is driven in the same direction as said set of moving flats, said grinding elements having a length so as to penetrate between said clothing elements and sweep over free ends of said clothing elements from behind as said grinding elements move relative to said set of flats.

Full Text

Grinding of Clothing The present invention concerns the grinding of clothing, in particular but not ex¬clusively, of the clothing of flats of a revolving flat card. The invention is applica¬ble to the mounting of a grinding apparatus onto the card, but is not restricted to this application and thus could be applied also to an apparatus to be placed onto a card and carried from card to card as required. The concept of the present in¬vention is laid out in such a manner that the apparatus may function on a running card. This point also does not constitute any restriction in the sense that the in¬vention could not be applied to a card at a standstill. State of the art: Grinding of the flat clothing is described in "Handbuch der textilen Fertigung, Die Kurzstapelspinnerei" (Handbook of Textile Manufacturing, Short Staple Spin¬ning) Volume 2: Putzerei und Karderie (Opening and Cleaning) (The Textile In¬stitute, Author: W. Klein), p. 58/59. The means applied in this process are well known since a long time - compare e.g. GB 22 533 issued 1895, DE 61636 is¬sued 1891 and DE 606 832 issued 1933. A further proposal suggesting that the revolving flat arrangement can be taken off the machine as a "module" for main¬tenance purposes is shown in DE 2741089 by Triitzschler. A more recent grind¬ing apparatus was described also in JP 57-112415 (published July 13 1982). In EP-C-322637 a grinding apparatus has been shown which constantly is in op¬eration, or operable respectively. This apparatus can be applied to the grinding the clothing of a flat, and a corresponding embodiment has been shown in the Fig. 3 of the EP-C-322637 which in the following will be discussed with reference to Fig. 2 of the present application; a more detailed discussion being dispensed with here. The invention: The present invention proposes a grinding apparatus characterized in that a plu¬rality of grinding elements is provided, which elements can penetrate between the points of the clothing to be ground, and sweepingly brush the head portions of the points. The grinding elements preferentially are elastically bendable. The grinding element can be arranged in such a manner that during operation they are distributed over the working width of the card. For this purpose they can be supported on an elongated support member e.g. in such a manner that one end of each grinding element is mounted onto the support member from which it extends at right angles. The arrangement can be laid out in such a manner that worn grinding elements (no longer in working order) can be replaced by exchanging the support member. For this purpose the support member can be formed by two half shells e.g. according to the principle explained with reference to the Figures 4 and 5 of the DE utility model 94 14 196. The grinding apparatus can comprise a support member which during operation can be mounted movably, e.g. rotatably. The support member can be mounted onto the card frame during operation using a holding device in a roughly predetermined relation to the revolving flat arrangement, e.g. in such a manner that the clothing of the flats can be ground while they pass through their "return cycle." The grinding elements, the support member and the holding device together can form a unit built into the card e.g. in such a manner that operation of the apparatus is started together with the card start-up. In this arrangement the card can comprise a drive, and a control device respectively, for the grinding apparatus, "fhe combined unit also could be designed in such a manner that it can be aUached to the card, in which case the unit would contain its own drive, and control mechanism respectively. Accordingly the present invention provides a carding machine for processing fiber material, said carding machine comprising a machine frame and a main drum disposed within said frame to receive fiber material; a set of moving flats disposed relative to said main drum to clean and open fiber material carried by said main drum, said flats comprising individual clothing elements protruding from a base member; a grinding apparatus disposed relative to said set of moving flats, said grinding apparatus comprising a plurality of grinding elements extending from a support member that is driven in the same direction as said set of moving flats, said grinding elements having a length so as to penetrate between said clothing elements and sweep over fi-ee ends of said clothing elements from behind as said grinding elements move relative to said set of flats thereby grinding said individual grinding elements. Embodiments of the present invention are described in more detail in the following with reference to various illustrated design examples. It is shown in: Fig. 1 a copy of the Figure 1 fi-om the EP Application Nr. 96 101 466 dated February 2, 1996 Fig. 2 a copy of the Fig. 3 from EP-C-322 637, Figures 3 to 5 copies of the Figures 3 through 5 from the DE Utility Model 94 14 196 mentioned above, Fig. 6 a first embodiment of the present invention in the form of a modification of the arrangement according to the Figures 3 to 5, Fig. 7 a schematic view of an individual clothing wire element seen from the front side visualising the grinding action. Fig. 8 a schematic side view of the same individual clothing wire element, Fig. 9 a schematic Isometric view of a second embodiment, a detail indicated in the Fig. 9 being shown in the Fig. 9A , Fig. 10 a schematic isometric view of a third embodiment, a detail indicated in the Fig. 10 being shown in the Fig. 10A, and in Figures 11 to 13 further alternative embodiments according to the Invention. In the Fig. 1 a revolving flat card 1 known as such, e.g. the C50 card produced by the applicant, is shown schematically. The fibre material in form of opened and cleaned fibre flocks is fed into the feed chute 2, and is taken over by a taker-in or licker-in roll 3 as a feed lap, is transferred to a main drum 4 and is opened further and cleaned by means of a set of revolving flats 5 driven forward or backward, as seen in the direction of the rotation of the drum 4 , along a closed loop path over deflecting rolls 6. Fibres from the web located on the main drum 4 then are taken over by a doffer 7 and in a delivery roll arrangement 8 are formed into a card sliv¬er 9. A coiler 10 then deposits the card sliver 9 into a can 11 in cycloid manner. The set of revolving flats 5 comprises revolving flats not shown individually in the Fig. 1 but indicated in the Fig. 2, and in the Fig. 3 respectively, with the reference sign 13. Each flat 13 is provided with clothing 14. Tlie flats 13 of the set of revolving flats 5 move "forward" from an entry point E through to an exit point A. The carding work is effected during the forward move¬ment. During the "return" movement the flats are cleaned while passing a clean¬ing point 60 - the cleaning action being explained in more detail in the following with reference to the Fig. 3. Subsequently the clothing 14 on the flats 13 could be ground according to EP C-322 637 as explained with reference to the Fig. 2. In the Fig. 2 a grinding device 32 is shown acting onto the flats 13. The grinding device 32 comprises a trough type container provided with two side walls 33 and a cover plate 34. The free rims 36 of the walls 33 extend parallel to the grinding device extending along the respective flat 13, and at right angles, respectively, to the direction of movement of the clothing 14. On the free rims 36 a support mem¬ber 37 in the form of a bendable strip extends in longitudinal direction (at right angles of the drawing plane) of the flat 13 over its full length. On its side facing the flat 13 the support member 37 is provided with a grinding coat consisting of e.g. fine grinding particles, in particular of diamond powder. The support member 37 can be e.g. a thin metallic strip, a fabric or a synthetic material strip provided with an abrasive coat, which strip adapts to local unevenness, i.e. to the geomet¬rical shape of the surface defined by the tips of the clothing, without being de¬formed by the grinding forces. Furthermore the strip is not to form any creases. A hose 38, closed at both ends, made from an elastic material extends inside the trough-shaped container 33, 34 over its full width. Via a valve 39 the hose 38 can be filled with a fluid under a desired pressure. During operation the hose 38 thus exerts the same pressure at any point along the support member 37. The support member 37 thus is pressed against the cover 13 and thus with its abrasive coat uniformly contacts the clothing 14. As a result even in the presence of irregulari¬ties in the height of the points of the clothing 14 uniform contact of the support member 37 over the full width of the cover 13 is maintained. This is effected as areas of the support member 37 moving into any humps or recesses can perform their movement only if neighbouring areas simultaneously perform movements comprising components in the direction parallel to the support member 37, i.e. a horizontal component as indicated in the Fig. 2. The grinding device siiown is only capable of acting upon the outer face areas of the wire points of the flat clothing. Even if conventional grinding devices function in similar manner their performance proves detrimental for certain types of cloth¬ing. Furthermore the relative movement between the grinding means and the clothing is too slow if the flat movement is relied upon. In the Fig. 3 a cleaning device is shown provided with a pivotable device 16 which is irrelevant within the scope of the present invention and thus is not de¬scribed further here. Furthermore the cleaning device comprises a brush roll 51 rotatable with a predetermined rotational speed and provided with bristles 50 ex¬tending on one hand down to the base of the clothing 14 of the flat 13 and on the other hand extend into the pivoting reach 52 (indicated schematically with a dash-dotted circular line) of the pivotable device 16. The latter is provided with clothing wires as can be seen from the Figures. As the bristles 50 extend into the pivoting reach 52 mentioned they are cleaned during the clockwise cleaning movement, as seen in the Fig. 3, of the device 16. In this arrangement the bristles are provided in rows, preferentially in a coiled ar¬rangement. The brush 51 extends over the full working width. Soon after leaving the device 16 a flat 13 contacts the brush 51 which then effects a second clean¬ing action. A hood 55 encloses a suction area 54. Into this area a suction duct 56 merges, which (e.g.) can be integrated into a system according to EP-A394 831, and EP-A-583 219 respectively. Dust and fly waste kicked up by the bristles 50 now are sucked into the suction area 54 and are eliminated via the suction duct 56. The suction of course also eliminates any material which falls off from the device 16. In the Figures 4 and 5 a preferred design example of the brush 51 is shown which in the following is described in more detail, in which arrangement the brush roll 51 (Fig. 3) is rotated by a shaft 57 via a drive (not shown). The drive shaft 57 is supported in bearings (not shown) which are mounted into the side walls 20. The drive shaft 57 thus can not be taken off from its support without an effort. The brush 51 is a wear part to be replaced from time to time. Basically the brush 51 consists of a sleeve 59 (Fig. 3) and the bristles 50 men¬tioned before. These bristles are provided on the sleeve 59 and extend radially away therefrom. According to the Fig. 4 the sleeve 59 is made up by two "half shells" 59A, the end portions of one half shell being shown in a side view in the Fig. 5. Each half shell has a cylindrical outer sleeve surface 62 and an inner surface 63, which in its mounted state tightly hugs the shaft 57. The two half shells which together form the sleeve 59 are identical as to the structure of the part sleeve 59A as well as to the array of bores 60 (Fig. 5) taking up the bristles 50. It thus is not required that any specific "pair" of such half shells be chosen to make up a brush 51, as any two half shells match as well as any other half shells. The bristle arrangements on the two half shells of a brush 51 thus do not repre¬ sent mutual mirror images but are arranged in such a manner that if the brush 51 is rotated over 180° about the longitudinal axis of the drive shaft 57 the bristles 50 of the one half shell 59A take up the positions previously held by the bristles 50 of the other half shell 59A. The half shells 59A each are provided with fastening means in the form of through bores 61. Bolts (not shown) can be inserted there through connecting the two half shells to the drive shaft 57. The drive shaft for this purpose is provid¬ed with two rows of bores (not shown) the inside of each bore being threaded, the bores of these rows being co-ordinated with the bores 61. However, alterna¬tive (preferentially easy to release) fastening means may be provided instead. More than two longitudinal elements of course can be provided to form the brush 51. The simple solution providing just two half shells presents considerable ad¬ vantages in comparison to more complex design solutions. In tire Fig. 6 a first design example according to the present invention is shown designed as a modification of the arrangement illustrated in the Figures 3 to 5. Accordingly a flat bar 13 (including its clothing 14), the sleeve 59 and the bristles 50 (as far as still present) are shown schematically again in the Fig. 6. The direc¬tion of movement of the flat bar 13 and the sense of rotation of the sleeve 59 are indicated by arrows. As usual in providing clothing on card flats the clothing chosen is a flexible or a semi-rigid clothing (compare the above mentioned handbook of textile manufac¬turing, Volume 2, p. 52) in which the individual clothing components 40 are each made from wire (of rectangular or round cross-section) forming a so-called knee 41. The bristles 50 penetrate down to the base of the clothing 14, i.e. down to the surface of the flat bar 13 from which the wires protrude, in such a manner that the clothing is cleaned thoroughly. In this arrangement, however, only half the cir¬cumference of the sleeve 59 is provided with bristles, the other half being provid¬ed with grinding elements 42 as will be discussed in more detail in the following with reference to the Figures 9 and 10. The sleeve 59 in this case serves a sup¬port member for the grinding elements 42 which together with their support mem¬ber and its holder arrangement form the grinding apparatus according to the pre¬sent invention. The grinding elements In this arrangement resemble the bristles 50 in so far as they are formed as elongated, elastically bendable elements protruding approxi¬mately radially from the sleeve surface of the sleeve 59. The grinding elements 42 also are more flexible than the wires 40, whereby during rotation of the sleeve in case of contact of one of these elements with a wire movement of the element relative to the wire the grinding element 42 has to yield. The elements 42 are chosen substantially shorter than the bristles 50 in such a manner that they can reach the "head portions" only of the clothing wires 40 (above the respective knees 41) - compare also the Figures 7 and 8. The speed of the free end portion of each element 42 still exceeds the speed of the clothing wires 40 in the direc¬tion of the flat movement 15. As the grinding elements sweep along the clothing elements 40 they penetrate into the clothing, their free end portions being de¬flected to both sides of the head portions of the wires 40 (Fig. 7). The head portion of each wire element is ground on its flanks in such a manner that its lateral flanks 43 (Figures 7 and 8) converge radially outwards forming an end edge 44. During each passage of the grinding elements 42 brushing the flank surfaces 43 these surfaces 43 are subject to a polishing or grinding action. The aggressiveness of the polishing or grinding action depends on the design of the grinding elements and on their relative speed of movement. The optimum ef¬fectiveness can be determined experimentally for each type of clothing wire. The solution described with reference to the Figures 6 to 8 presents certain ad¬vantages for retrofitting on existing cards. The "infrastructure" (i.e. the support member in the form of a sleeve 59, its holding device in the form of the drive shaft 57, its bearing arrangement and its corresponding drive arrangement (not shown here) are present already on the existing card. Furthermore the apparatus ac¬cording to the design example described can be installed easily as just one of the "half shells" according to the Figures 4 and 5 is to be provided with grinding elements 42 instead of the bristles 50. The flat cleaning device is working contin¬ually (as long as the card is in operation), and the clothing wires on the flats thus are ground "continually". But on the other hand certain disadvantages of this so¬lution are to be incurred, however: - cleaning efficiency decreases, as half the bristles 50 are "missing", - obtaining optimum cleaning effectiveness as well as optimum grinding action may not be possible by adapting the rotational speed of the drive shaft 57 (Fig. 3), - it is not possible to "stop" just the grinding action e.g. in order to perform peri¬odic grinding (according to a "stop and go" method. A grinding method of this type has been described e.g. in EP-A-565 486. In certain cases it thus will prove advantageous if a separate infrastructure is pro¬vided on the card, in particular a separate holding device for the support member (on which the grinding elements 42 are mounted) and a separate (and, if requir¬ed, controllable) drive arrangement. In an arrangement of this type a desired speed of the grinding elements relative to the clothing wires exceeding 15 m/s (e.g. of 20 m/s) can be reached, which speed would not be of optimum suitability for cleaning bristles. The grinding point in this arrangement is separated from the cleaning point and preferentially is situated downstream, as seen in the direction 15 of flat movement (Fig. 6), from the cleaning point. If a control programme is de¬sired for controlling the flat clothing grinding process, a programme of such type can be integrated in the card control system. If the grinding apparatus is laid out independently of the cleaning device, no sleeve 59 is required as support mem¬ber and the grinding device does not necessarily have to be arranged rotatably. The relative movement between the grinding elements and the clothing wires can hardly be effected by the movement of the clothing wires in the direction 15 (Fig. 6) alone, i.e. a stationary support of the grinding elements normally will not be sufficient. In a further alternative solution the grinding elements could be moved linearly along the path of the movement of the flat bars 13, an arrangement which could cause problems as it generally is considered undesirable that the grinding ele¬ments first impact the free end of a clothing wire. After a grinding movement in a direction in which the grinding elements approaches, and sweeps over, the free end of the clothing wire "from behind", the grinding elements eventually are to be "pulled out" before they are moved back to the starting point of the subsequent grinding movement, which arrangement is complicated and thus cost-intensive. A lifting movement also requires relatively ample space within the revolving flat arrangement. For these reasons the support member of the grinding elements preferentially are arranged rotatably in the card, regardless of whether the sup¬port member consists of half shells 59A or of a cylindrical sleeve. For simplicity only the last mentioned possibility is shown in the Figures 9 and 10. The alternative solution according to the Fig. 9 comprises a coil type array of grinding elements 42 along a cylindrical support member. Each element is sha¬ped as a bristle 45 (compare particularly the detail shown in the Fig. 9A). The bristles 45 are shorter than the bristles 50 in the arrangement described with reference to the Fig. 6 and the free end of each bristle 45 is coated with an abra- sive forming a grinding area (grinding element). The coating consists for exam¬ple of hard particles 46 (grinding particles, diamond particles or similar) secured to the bristle 45 by adhesive. The coil-shaped row of elements 42 extends over the full length of the support member and thus over the full working width. On the side of the sleeve 59 which is not visible in the Fig. 9 a second row of grinding elements can be arranged forming a mirror image of the first row. The alternative design example according to the Fig. 10 also comprises a coil-shaped array of grinding elements 42, which in this case are provided in the form of grinding lamellae 47 (compare particularly the detail shown in the Fig. 10A) which also are coated with an abrasive in the form of hard (grinding) particles. The lamellae 47 can be made e.g. from "emery cloth". The design example shown partially only in the Fig. 11 corresponds to the alter¬native design examples according to the Figures 9 and 10 in so far as they are made up by coating a base body. In the Fig. 11 the base body is formed by a disc 48 both sides of which are coated with hard particles, in which arrangements the disk forms a "grinding wheel". The discs can be of annular shape and of a thick¬ness that can vary in radial direction in such manner that they are thinner at the outer edge and thicker at the Inner edge. The inner portion of each disc can be fastened to a support member (not shown) which is rotatably mounted on the ma¬chine. The disks 48 are fastened in such a manner that they rotate together with their support member. Their (relatively thin) outer edge portions form elastically bendable grinding areas the function of which resembles the one of the free ends of the elements 42 according to the solution described with reference to the Fig. 7, i.e. they yield under contact with the head portion of a clothing wire but they grind the flanks 43 as they sweepingly brush along them. The solutions according to the Figures 12 and 13 are designed differently as the are not provided with a coating but rely on the abrasive action of the base body itself. For this purpose the surface of each of the elastically bendable bodies (or of each "flexible finger" respectively) is "profiled", in one case (Fig. 12) by forming longitudinal ribs 49A and by forming transverse ribs 49B. The material of which the elements, or the fingers respectively, are made, should be hard in compari¬son to the metal of the clothing wires to be ground, e.g. steel bristles. The description thus far has been based on the assumption that the grinding ap¬paratus should be built into the card. The present invention, however, is not re¬stricted in any way to an arrangement of the type mentioned. The card could be provided e.g. with mounting points merely to which a support arrangement of the grinding apparatus could be attached. The grinding apparatus itself could be moved from card to card and be mounted and operated on a particular card only if required. An apparatus of this type could be equipped with its own separate drive arrangement for rotating the support member to which the grinding ele¬ments are fastened, or could be provided with a clutch arrangement merely for temporarily establishing a connection with the drive arrangement of the machine. The preferred solution comprises a grinding apparatus provided with its own "in¬frastructure" (support member, drive arrangement, etc.,) and with grinding ele¬ments according to the Fig. 9 in which arrangement the support member 59 pre¬ferentially is "fully clothed" (instead of being provided with individual coil-shaped remains of grinding element arrangements) i.e. provided with grinding elements covering substantially the whole circumference. WE CLAIM: 1. A carding machine for processing fiber material, said carding machine comprising: a machine frame and a main drum (4) disposed within said frame to receive fiber material; characterized in that, a set of revolving flats (5) is disposed relative to said main drum (4) to clean and open fiber material carried by said main drum, said flats (13) comprises individual clothing elements (14) protruding from a base member; a grinding apparatus (32) is disposed relative to said set of revolving flats, said grinding apparatus comprises a plurality of grinding elements (42) extending from a support member (37) that is driven in the same direction as said set of revolving flats, said grinding elements having a length so as to penetrate between said clothing elements and sweep over free ends of said clothing elements from behind as said grinding elements move relative to said set of flats thereby grinding said individual grinding elements. 2. The carding machine for processing fiber material as claimed in claim 1, wherein said flats are movable in a forward direction relative to said main drum (4) and in a return direction, said grinding apparatus (32) disposed along a return direction of said flats, said grinding apparatus comprising a plurality of grinding elements (42) from a rotatable support member (37), said grinding elements having a length so as to penetrate between and sweep over free ends of said clothing elements. 3. The carding machine as claimed in any one of the preceding claims, wherein said grinding elements are formed from an elastic bendable material. 4. The carding machine as claimed in claim 1 or 2, wherein said set of flats comprises a working width, said grinding elements distributed over said working width to grind said individual clothing elements over said working width. 5. The carding machine as claimed in any one of the preceding claims, wherein said support member comprises an elongated member extending across said working width. 6. The carding machine as claimed in claim 4, wherein said support member comprises half shell members (59A). 7. The carding machine as claimed in claim 1, wherein said support member and attached grinding elements are replaceable in said machine frame. 8. The carding machine as claimed in claim 1, wherein said support member is rotatably driven. 9. The carding machine as claimed in claim 1, wherein said set of revolving flats are driven in a revolving path including a return path, said grinding apparatus disposed to grind said clothing elements as said set of revolving flats moves through said return path. 10. The carding machine as claimed in claims 1 or 2, wherein said grinding apparatus is portable and removably cormected to said machine frame. 11. The carding machine as claimed in claim 1, comprising a control system configured for controlling operation of said carding machine, said grinding apparatus integrated with and controlled by said control system. 12. The carding machine as claimed in claim 11, wherein said control system comprises a drive system, said grinding apparatus driven by said drive system. 13. The carding machine as claimed in claims 1 or 2, wherein said grinding apparatus comprises a drive system removable therewith wherein said grinding apparatus is drivable independent from a drive system of said carding machine. 14. The carding machine as claimed in claim 1 or 2, wherein said grinding elements move in a direction relative to said clothing elements so that said grinding elements extend between and contact said clothing elements before said free ends of said clothing elements are swept over by said grinding elements. 15. The carding machine as claimed in claim 14, wherein said clothing elements extend at a tangential angle relative to said base member. 16. The carding machine as claimed in claims 1 or 2, comprising a cleaning system disposed to clean said set of revolving flats, said grinding apparatus integrated with said cleaning system. 17. A grinding apparatus for a carding machine having a machine frame and set of revolving flats mounted thereon wherein said flats comprise individual clothing elements protruding from a base member, said grinding apparatus comprising: a support member, and means for mounting said support member on said machine frame; means for driving said support element in the same direction as said set of flats; and a plurality of individual grinding elements mounted on and extending from said support member and having a length so as to extend between said individual clothing elements, said grinding elements bendable relative to said clothing elements so that said grinding elements extend between and sweep over said individual clothing elements from behind as said grinding elements move relative to said flats. 18. The grinding apparatus as claimed in claim 17, wherein said grinding elements are formed of an elastic material. 19. The grinding apparatus as claimed in claim 17, wherein said support member comprises an elongated member having a length so as to extend across a working width of said flats. 20. The grinding apparatus as claimed in claim 19, wherein said support member comprises half shell members. 21. The grinding apparatus as claimed in claim 19, wherein said support member is removably mountable to said machine frame. 22. The grinding apparatus as claimed in claim 17, wherein said support element with attached grinding elements is a replaceable component. 23. The grinding apparatus as claimed in claim 17, wherein said support element is rotatably driven. 24. The grinding apparatus as claimed in claim 17, wherein said means for driving said support element comprises a drive system of said carding machine, said support element operably connectable to said carding machine drive system. 25. The grinding apparatus as claimed in claim, 17, wherein said grinding apparatus is portable and is removably attachable to different carding machines. 26. The grinding apparatus as claimed in claim 25, wherein said means for driving said support element comprises a portable drive system that operates independent of a drive system of said carding machine. 27. A carding machine for processing fiber material substantially as herein described with reference to the accompanying drawings. 28. A grinding apparatus for a carding machine substantially as herein described with reference to the accompanying drawings.

Documents:

0740-mas-1997 abstract-duplicate.pdf

0740-mas-1997 abstract.pdf

0740-mas-1997 claims-duplicate.pdf

0740-mas-1997 claims.pdf

0740-mas-1997 correspondence-others.pdf

0740-mas-1997 correspondence-po.pdf

0740-mas-1997 description (complete)-duplicate.pdf

0740-mas-1997 description (complete).pdf

0740-mas-1997 drawings-duplicate.pdf

0740-mas-1997 drawings.pdf

0740-mas-1997 form-19.pdf

0740-mas-1997 form-2.pdf

0740-mas-1997 form-26.pdf

0740-mas-1997 form-4.pdf

0740-mas-1997 form-6.pdf

0740-mas-1997 others.pdf

0740-mas-1997 petition.pdf