A spreader apparatus for spreading manure

Abstract: A spreader apparatus is disclosed for spreading manure. The apparatus includes a container which defines an opening for the reception therein of the manure. The container (12) has a first (18) and a second (20) end zone with the first end zone (18) defining an outlet (22) for the discharge therethrough of the manure. A rotatable feed device is disposed within and co-operates with the container for feeding the manure through the container. The feed device (26) has an axis of rotation (30) which extends through the end zones of the container. A rotatable discharge device (32) is disposed within the container and co-operates with the container and the feed device for moving the manure towards the outlet. The discharge (32) device has a further axis of rotation which is disposed spaced and parallel to and laterally below the axis of rotation of the feed device (26). The arrangement is such that when the feed and discharge devices are rotating, all of the manure within the container is fed at a substantially constant rate towards the outlet.

Description: The present invention relates to a spreader apparatus for spreading manure. More particularly, the present invention relates to a spreader apparatus for spreading manure over a field to be used for agricultural purposes. Many farms include provisions for both the cultivation of arable farm land and the housing of livestock such as cows, beef cattle, chickens etc. Typically, the manure from the livestock is collected as a useful source of natural fertilizer. Such manure is subsequently distributed on the land, thereby increasing the yield of the crops cultivated thereon. Many mechanical arrangements have been devised for spreading such manure onto the surface of a field to be cultivated. Usually, such apparatus includes a cart having a container thereon with a conveyer for conveying the manure towards a spreader paddle which distributes the manure from the cart as the cart is drawn by a tractor. More recently, as taught in U.S. Patent number 4,479,608 to Martin, a wheeled container includes a rotatable auger disposed adjacent to the base of a V-shaped container. The arrangement is such that the manure within the container is moved by the auger towards the end of the container where a paddle extending from the shaft of the auger projects the manure laterally through a discharge outlet defined by the container. The arrangement is such that the manure is distributed over the field by the tractor drawn container. The aforementioned spreader apparatus also typically includes an auxiliary shaft disposed adjacent to the discharge outlet. Such auxiliary shaft has a plurality of radially extending hammer elements which rotate at a relatively high rotational speed for shredding and disintegrating the manure as the manure is discharged through the outlet. In the aforementioned arrangement, there exist a tendency for the manure, particularly when in a semi-solid and/or fibrous state, to become bridged over the discharge auger. Such bridging is caused primarily because the side walls of the container must of necessity converge in a downward direction towards the discharge auger so that the manure is fed by gravity to the auger. If the side walls were disposed substantially parallel to each other, the capacity of the container would be severely limited. A typical container of the aforementioned type has a capacity of approximately ten cubic yards. Consequently, the angle defined between each side wall and the vertical is approximately 35 degrees. Accordingly, the angle defined between the side walls of a single auger spreader is in the region of seventy degrees so that bridging of the auger by the manure becomes a substantial problem. In practice, in the design of spreaders, such spreaders have been made as large as possible so that frequent refilling of the spreader is avoided. However, in order to provide such increased capacity, the angle between the side walls must be increased and this leads to the aforementioned problem of bridging. When the manure bridges over the auger within the container, no manure is fed by the auger towards the discharge outlet. Therefore, it is necessary for the operator to manually break the bridge before continuing the distribution cycle. Not only is the aforementioned problem inconvenient and time consuming, but also such delays caused by bridging generate an uneven distribution of the manure over the field which subsequently results in uneven crop growth. Additionally, in a spreader apparatus having a feed auger and a discharge auger, as disclosed in GB-A-2235117, with the axis of rotation of the discharge auger being disposed spaced and parallel to and laterally below the rotational axis of the feed auger, the arrangement should be such that when the majority of the manure has been discharged from the container, the remaining manure within the container is fed directly and radially relative to the feed auger into mesh with the lower discharge auger so that the rate of discharge of the manure through the outlet remains relatively constant throughout the discharge of the entire load from the container. Such constant discharge results in an even manure spread pattern. Also, the operator spends less time spreading a load of manure because the speed at which unloading is accomplished is increased due to the absence of bridging and no slowing down of the discharge rate towards the end of the spreading cycle. An objective of the present invention is the provision of a spreader apparatus for spreading manure which includes a feed auger and a discharge auger, the axis of rotation of the discharge auger being spaced and parallel to and disposed laterally below the rotational axis of the feed auger, and in which the discharge of manure from the outlet remains substantially constant during discharge of an entire load from the spreader apparatus. Another object of the present invention is the provision of a spreader apparatus for spreading manure in which the problem of bridging over the auger within the container is overcome. Other objects and advantages of the present invention will become readily apparent to those skilled in the art by a consideration of the detailed description contained hereinafter taken in conjunction with the annexed drawings. Accordingly, the present invention provides a spreader apparatus for spreading manure, said apparatus comprising: a container defining an opening for the reception therein of the manure, said container having a first and a second end zone, said first end zone defining an outlet for the discharge therethrough of the manure; a base extending between said end zones; a first and a second side wall separated from each other by said base, said side walls extending between said end zones; a first and a second end wall, secured to said side walls and to said base, said first and second end walls being disposed within said first and second end zones respectively, the arrangement being such that said base, said side walls and said end walls co-operate together to contain the manure; a rotatable feed means disposed within and co-operating with said container for feeding the manure through said container, said feed means having an axis of rotation which extends through said end zones of said container; and a rotatable discharge means disposed within said container and co-operating with said container and said feed means for moving the manure towards said outlet, said discharge means having a further axis of rotation which is disposed spaced and parallel to and laterally below said axis of rotation of said feed means, said further axis extending through said end zones of said container, the arrangement being such that when said feed means and said discharge means are rotating, the manure is fed by said feed means from said feed means to said discharge means so that all of the manure within the container is fed at a substantially constant rate towards said outlet; characterised in that said base further includes a first portion which co-operates with said feed means such that when said feed means is rotating, the manure is fed through said container partially due to an interaction between said feed means and said first portion; and a second portion disposed at a lower elevation relative to said first portion, said second portion co-operating with said discharge means such that when said discharge means is rotating, the manure is moved towards said outlet partially due to an interaction of said discharge means and said second portion. The invention also provides a method for spreading manure according to claim 16. The apparatus of the present invention may also be used for spreading materials other than manure such as sewage sludge and lime sludge and other types of fertilizers. The invention will now be described by way of example with reference to the accompanying drawings in which: Fig. 1 is a perspective view of a prior art spreader apparatus showing the problem of bridging; Fig. 2 is a top plan view of a spreader apparatus according to the present invention; Fig. 3 is a sectional view taken on the line 3-3 of fig. 2; Fig. 3A is a similar view to that shown in Fig. 3 but shows an alternative embodiment of the present invention in which a plurality of vanes extend respectively from the feed and discharge shafts; Similar reference characters refer to similar parts throughout the various embodiments of the present invention. Fig 1. is a perspective view of a prior art spreader apparatus generally designated 2 for spreading manure. The spreader 2 includes a single auger 4 and side walls 5 and 6 which cause bridging of the manure as shown at 8. The spreader apparatus of the present invention as shown in Fig 2 overcomes the bridging problem and provides an even distribution of the manure load therefrom. Fig. 2 is a top plan view of a spreader apparatus generally designated 10 according to the present invention. Additionally, Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2. The apparatus 10 includes a container generally designated 12 which defines an opening 14, shown in Fig. 3, for the reception therein of manure as indicated by the arrow 16. The container 12 has a first and a second end zone 18 and 20 respectively. The first end zone 18 defines an outlet 22 for the discharge therethrough of manure as indicated by the arrow 24. A rotatable feed auger generally designated 26 is disposed within and co-operates with the container 12 for feeding the manure as indicated by the arrow 28 through the container 12. The feed auger 26 has an axis of rotation 30 which extends through the end zones 18 and 20 respectively of the container 12. A rotatable discharge auger generally designated 32 is disposed within the container 12 and co-operates with the container 12 and the feed auger 26 for moving the manure 16 towards the outlet 22. The discharge auger 32 has a further axis of rotation 34 which is disposed spaced and parallel to and laterally below the axis of rotation 30 of the feed auger 26 as shown in Fig. 3. The arrangement is such that when the augers 26 and 32 respectively are rotating, as indicated by the arrows 36 and 38, all of the manure 16 within the container 12 is fed at a substantially constant rate towards the outlet 22. As shown in Fig. 2, the container 12 further includes a base generally designated 40 which extends between the end zones 18 and 20. Fig. 3 shows the first and second side walls 42 and 44 respectively separated from each other by the base 40. The side walls 42 and 44 extend between the end zones 18 and 20. As shown in Fig. 2, the first and second end walls 46 and 48 are secured to the side walls 42 and 44 and to the base 40. The first and second end walls 46 and 48 respectively are disposed within the first and second end zones 18 and 20 respectively. The arrangement is such that the base 40, the side walls 42 and 44 and the end walls 46 and 48 co-operate together to contain the manure 16. As shown particularly in fig. 3, the base 40 also includes a first portion 50 which co-operates with the feed auger 26 such that when the feed auger 26 is rotating as indicated by the arrow 36, the manure 16 is fed through the container 12 partially due to an interaction between the feed auger 26 and the first portion 50. A second portion 52 of the base 40 is disposed at a lower elevation relative to the first portion 50. The second portion 52 co-operates with the discharge auger 32 such that when the discharge auger 32 is rotating as indicated by the arrow 38, the manure 16 is moved towards the outlet 22, as indicated by the arrow 54 shown in Fig. 2. Such movement is at least partially due to an interaction of the discharge auger 32 and the second portion 52. More specifically, as shown in Fig. 3, the first portion 50 and the further axis of rotation 34 of the discharge auger 32 are disposed at substantially the same elevation such that when the feed auger 26 is rotating as indicated by the arrow 36, the manure 16 is fed directly by the feed auger 26 to the discharge auger 32 as indicated by the arrow 56 without the manure 16 having to travel to the second end zone 20. The first portion 50 guides the manure 16 directly as indicated by the arrow 56 from the feed auger 26 into mesh with the discharge auger 32 particularly when the amount of manure within the container 12 is minimal as indicated at 58. The arrangement is such that when the majority of the manure within the container 12 has been discharged and the minimal amount 58 remains within the container, such minimal amount 58 is discharged at substantially the same rate as the rate of discharge of the majority. The first portion 50 is disposed at an elevational distance D from the second portion. The distance D is at least 1/3rd of the diameter of the discharge auger. The side walls 42 and 44 each define therebetween an angle A within the range from 1 to 60 degrees so that the side walls 42 and 44 converge towards each other in a direction from the opening 14 towards the base 40 such that the manure 16 is assisted under the influence of gravity to move in the direction as indicated by the arrow d from the opening 14 towards the augers 26 and 32. The second side wall 44 as shown in Fig. 2. defines the outlet 22. Each of the end walls 46 and 48 respectively define apertures 60,62,64 and 66 respectively for the rotatable reception therein of the augers 26 and 32 such that the augers 26 and 32 are rotatably supported by the end walls 46 and 48. The feed auger 26 includes a longitudinal shaft 68 which has a first and a second end 70 and 72 respectively. The first end 70 is rotatably supported adjacent to the first end zone 18. The second end 72 is rotatably supported adjacent to the second end zone 20. A helical flight 74 is secured along the length thereof to the shaft 68 such that as the shaft 68 is rotated as indicated by the arrow 36, the manure 16 within the container 12 and disposed adjacent to the flight 74 is urged by the flight 74 in a first direction as indicated by the arrow 28 from the first end 70 towards the second end 72 of the shaft 68. Additionally, the manure 16 is also moved in a second direction radially away from the shaft 68 as indicated by the arrow 56. Such movement in the second direction 56 increases particularly, when a majority of the manure 16 within the container 12 has been discharged as shown at 58 so that a minimal amount 58 of the manure 16 remaining in the container 12 moves radially away from the shaft 68 into mesh with the discharge auger 32 as shown by the arrow 56 rather than traversing the container 12 towards the second end zone 20 thereof before being urged into mesh with the discharge auger 32. The feed auger 26 has a diameter within the range 38.1cms to 76.2cms. and the augers 26 and 32 are separated from each other by a distance S shown in Fig. 3 within the range 0 to 15.24cms. Furthermore, the feed auger 26 also includes a plurality of paddles 76,77,78,79,80,81,82 and 83 which extend radially from and are staggered circumferentially around the second end 72 of the shaft 68. The arrangement is such that when the shaft 68 is rotating as indicated by the arrow 36, manure in the vicinity of the paddles 76-83 is urged away from the second end 72 of the shaft 68 towards the discharge auger 32 as indicated by the arrow 84. The discharge auger 32 also includes a further shaft 86 having a first and second extremity 88 and 90 respectively, which are disposed adjacent to the first and second end zones 18 and 20 respectively. A further helical flight 92 is secured along the length thereof to the further shaft 86 such that when the further shaft 86 is rotating as indicated by the arrow 38, the manure 16 is moved by the further flight 86 from the second extremity 90 towards the first extremity 88 of the further shaft 86 towards the outlet 22. The discharge auger 32 also includes a plurality of further paddles 94,95, and 96 as shown in Fig. 2 which extend substantially radially from and are staggered circumferentially around the first end 88 of the further shaft 86. The arrangement is such that when the further shaft 86 is rotating as indicated by the arrow 38, the manure 16 is discharged by the further paddles 94-96 through the outlet 22. The discharge auger 32 has a diameter within the range 38.1 to 76.2cms. Fig. 3A is a similar view to that shown in Fig. 3 but shows an alternative embodiment of the present invention in which the helical flight 74 is replaced by a plurality of generally radially extending vanes 100, 101 and 102 extending from the shaft 68. Also, the discharge shaft 86 is provided with radial vanes 103, 104 and 105 in place of the further helical flight 92. In the operation of the apparatus according to the present invention, during rotation of the feed auger, the manure is fed in a first direction 28 substantially parallel to the axis of rotation 30 of the feed auger. However, the feed auger also imparts a substantially radial component to the manure as indicated by the arrow 56. The arrangement is such that any voids in the manure flowing in the direction 54 towards the outlet are automatically filled by such radial flow component. It will be appreciated by those skilled in the art that in practice, the manure will have various flow vectors dependent upon the existence of voids within the flow 54 and the speed of rotation of the feed auger and the consistency of the manure. Nevertheless, the present arrangement is particularly advantageous in dispensing the remainder of the manure from the container because during discharge of such residue, the manure moved by the discharge auger will include voids which will be readily filled by such radial flow thus avoiding the time needed for such manure having to flow to the second end of the feed auger and back by means of the discharge auger. Therefore, the actual flow of manure is a vector of the first and second directions but if no voids exist, such flow will be primarily axially along the feed auger. The aforementioned radial flow of manure from the feed auger is primarily due to the absence of any containment of the manure at the termination of the first portion 50, that is the juncture of 50 and 52. Although the height of the portion 50 above 52 can be provided according to the type of manure being spread, applicants have discovered that 50 should be at a height equivalent to at least 1 / 3 of the diameter of the discharge auger. The arrangement in which vanes are used instead of helical flights operates in substantially the same manner as that when augers are used. Those skilled in the art will appreciate that in all of the embodiments of the present invention, the respective directions of rotation of either shaft can be changed independently providing the sense of the flight or vanes is altered accordingly. Noting vanes and flights can be interchanged independently on each auger also. Additionally, although the apparatus is shown including tires and a towing tongue, the present invention is equally applicable to an apparatus mounted on a truck chassis or the like. Accordingly, Applicants discovered that by the provision of the feed auger and particularly the higher elevation thereof there existed a tendency for the manure to move radially away from the feed auger directly into mesh with the discharge auger, such radial feeding being also assisted by gravity. Therefore, particularly towards the discharge of the remaining amount within the container, such manure moves radially into mesh with the discharge auger without such manure having to be moved all the way along the first portion of the base towards the crossover point adjacent the second end zone of the container. Consequently, the present invention provides a more even and constant rate of flow of the manure from the feed to the discharge auger so that such manure is evenly distributed through the outlet. The present invention also provides a spreader apparatus which enables the side walls thereof to be closer to the vertical thereby inhibiting any tendency for the manure to bridge within the container. The present invention also provides means for discharging the manure from the container at a relatively constant rate for the entire load within the container.

Claims: A spreader apparatus (10) for spreading manure, said apparatus comprising: a container (12) defining an opening (14) for the reception therein of the manure, said container (12) having a first (18) and a second (20) end zone, said first end zone (18) defining an outlet (22) for the discharge therethrough of the manure; a base (40) extending between said end zones (18,20); a first (42) and a second (44) side wall separated from each other by said base (40), said side walls (42,44) extending between said end zones; a first (46) and a second (48) end wall, secured to said side walls (42,44) and to said base (40), said first and second end walls (46,48) being disposed within said first and second end zones (18,20) respectively, the arrangement being such that said base (40), said side walls (42,44) and said end walls (46,48) co-operate together to contain the manure; a rotatable feed means (26) disposed within and co-operating with said container (12) for feeding the manure through said container (12), said feed means (26) having an axis of rotation (30) which extends through said end zones (18,20) of said container (12); and a rotatable discharge means (32) disposed within said container (12) and co-operating with said container (12) and said feed means (26) for moving the manure towards said outlet (22), said discharge means (32) having a further axis of rotation (34) which is disposed spaced and parallel to and laterally below said axis of rotation (30) of said feed means (26), said further axis (34) extending through said end zones (18,20) of said container (12), the arrangement being such that when said feed means (26) and said discharge means (32) are rotating, the manure is fed by said feed means (26) from said feed means (26) to said discharge means (32) so that all of the manure within the container (12) is fed at a substantially constant rate towards said outlet (22); characterised in that said base (40) further includes a first portion (50) which co-operates with said feed means (26) such that when said feed means (26) is rotating, the manure is fed through said container (12) partially due to an interaction between said feed means (26) and said first portion (50); and a second portion (52) disposed at a lower elevation relative to said first portion (50), said second portion (52) co-operating with said discharge means (32) such that when said discharge means (32) is rotating, the manure is moved towards said outlet (22) partially due to an interaction of said discharge means (32) and said second portion (52). A spreader apparatus as claimed in claim 1, wherein said first portion (50) is disposed at an elevation above said second portion (52), such elevation being equivalent to at least 1/3 the diameter of said discharge means (32) such that when said feed means (26) is rotating, the manure is fed directly from said feed means (26) to said discharge means (32) without the manure having to travel to said second end zone (20), said first portion (50) guiding the manure directly from said feed means (26) into mesh with said discharge means (32) even when the amount of manure within said container (12) is minimal so that when a majority of the manure within said container (12) has been discharged and said minimal amount remains within said container (12), such minimal amount is discharged at substantially the same rate as the rate of discharge of said majority. A spreader apparatus as claimed in claim 2, wherein said first portion (50) is disposed within the range 12.7-35.56 cm higher than said second portion (52). A spreader apparatus as claimed in any preceding claim, wherein said side walls (42,44) each define therebetween an angle within the range from 1 to 60 degrees so that said side walls (42,44) converge towards each other in a direction from said opening (14) towards said base (40) such that the manure is assisted under the influence of gravity to move in said direction from said opening (14) towards said feed means (26) and said discharge means (32). A spreader apparatus as claimed in any preceding claim, wherein said second side wall (44) defines said outlet (22). A spreader apparatus as claimed in any preceding claim, wherein each of said end walls (46,48) defines apertures (60,62,64,66) for the rotatable reception therein of said feed means (26) and said discharge means (32) such that said feed means (26) and said discharge means (32) are rotatably supported by said end walls (44,46). A spreader apparatus as claimed in any preceding claim, wherein said feed means (26) is a feed auger which includes: a longitudinal shaft (68) having a first (70) and a second (72) end, said first end (70) being rotatably supported adjacent to said first end zone (18), said second end (72) being rotatably supported adjacent to said second end zone (20); a helical flight (74) secured along the length thereof to said shaft (68) such that when said shaft (68) is rotated, the manure within said container (12) and disposed adjacent to said flight (74) is urged by said flight (74) in a first direction (28) from said first end (70) towards said second end (72) of said shaft (68), the manure also being moved in a second direction (56) radially away from said shaft (68), such movement in said second direction (56) increasing particularly when a majority of the manure within said container (12) has been discharged so that a minority of the manure remaining in said container (12) moves radially away from said shaft (68) into mesh with said discharge means (32) rather than traversing said container (12) to said second end zone (20) thereof before being urged into mesh with said discharge means (32). A spreader apparatus as claimed in claim 7, wherein said feed auger (26) has a diameter within the range 38.1-76.2 cm. A spreader apparatus as claimed in claim 7 or claim 8, wherein said feed auger (26) and said discharge means (32) are separated from each other by a distance (S) within the range of 0-15.24 cm. A spreader apparatus as claimed in any of claims 7, 8 or 9, wherein said feed auger (26) further includes: a plurality of paddles (76-83) extending radially from and staggered circumferentially around said second end (72) of said shaft (68) such that when said shaft (68) is rotating, manure in the vicinity of said paddles (76-83) is urged away from said second end (72) of said shaft (68) towards said discharge means (32). A spreader apparatus as claimed in any one of claims 7, 8, 9 or 10, wherein said discharge means (32) is a discharge auger which includes: a further shaft (86) having a first (88) and a second (90) extremity disposed adjacent to first (18) and second (20) end zones respectively; a further helical flight (92) secured along the length thereof to said further shaft (86) such that when said further shaft (86) is rotating, the manure is moved by said further flight (92) from said second extremity (90) towards said first extremity (88) of said further shaft (68) towards said outlet (22). A spreader apparatus as claimed in claim 11, wherein said discharge auger (32) further includes: a plurality of further paddles (94-96) extending substantially radially from and staggered circumferentially around said first end (88) of said further shaft (86) such that when said further shaft (86) is rotating, the manure is discharged by said further paddles (94-96) through said outlet (22). A spreader apparatus as claimed in any one of claims 1 to 6 wherein said feed means includes: a longitudinal feed shaft (68) having a first (70) and a second (72) end, said first end (70) being rotatably supported adjacent to said first end zone (18), said second end (72) being rotatably supported adjacent to said second end zone (20); and a plurality of vanes (100-102) generally radially extending from said shaft (68) and disposed between said first and second ends (70,72) of said shaft (68) such that during rotation of said shaft (68), the manure within said container (12) and disposed adjacent to said vanes (100-102) is urged by said vanes (100-102) not only in a first direction (28) from said first end (70) towards said second end (72) of said shaft (68) but also in a second direction (56) away from said shaft (68) to fill any voids in the manure moving along said discharge means (32) towards said outlet (22). A spreader apparatus as claimed in claims 1 to 7 or 13, wherein said discharge means (32) has a diameter within the range 38.1-76.2 cm. A spreader apparatus as claimed in claims 1 to 6 or 13, wherein said discharge means (32) includes: a discharge shaft (86) having a first (88) and a second (90) extremity disposed adjacent to said first and second end zones (18,20) respectively; a plurality of vanes (103-105) radially extending from said discharge shaft (86) and disposed between said first and second extremities (88,90) of said discharge shaft (86) such that during rotation of said discharge shaft (86), the manure is moved by said plurality of vanes (103-105) from said second extremity (90) towards said first extremity (88) of said discharge shaft (86) towards said outlet (22). A method for spreading manure, said method comprising the steps of: receiving the manure through an opening (14) defined by a container (12), said container (12) having a first end zone (18) and a second end zone (20), and a base (40) extending between said end zones (18,20), rotating a feed auger (26) disposed within the container (12) such that the feed auger (26) moves the manure through the container (12); and rotating a discharge auger (32) which is disposed with an axis of rotation (34) extending through said first and second end zones (18,20) of said container (12) and spaced and parallel to and laterally below an axis of rotation (30) of the feed auger (26) such that when a majority of the manure within the container (12) has been discharged by the discharge auger (32) through an outlet (22) defined by the container (12), a minimal amount of the manure remaining within the container (12) is moved in a second direction (56) radially away from the feed auger (26) into mesh with the discharge auger (32) rather than moving in a first direction (28) parallel to the axis of rotation (30) of the feed auger (26), the arrangement being such that the manure is fed by the feed auger (26) from the feed auger (26) to the discharge auger (32) so that all of the manure within the container (12) is discharged from the outlet (22) at a substantially constant rate, characterised in that rotating said feed auger (26) causes the manure to be fed through said container (12) partially due to an interaction between said feed auger (26) and a first portion (50) of said base (40) and in that rotating said discharge auger (32) causes the manure to be moved towards said outlet (22) partially due to an interaction of said discharge auger (32) and a second portion (52) of said base (40) disposed at a lower elevation relative to said first portion (50).

Inventors: JORANLIEN RIC S, KNIGHT STANLEY W, SAUNDERS WILLIAM M, JORANLIEN, RIC S., KNIGHT, STANLEY W., SAUNDERS, WILLIAM M.
Applicants: KNIGHT MFG CORP, KNIGHT MANUFACTURING CORP.
Application year: 1993
Main classification: A01C3
IPC codes: A01C15, A01C3