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Plough
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Patent number 4,350,208
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Issue date Sep 21, 1982
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Cornelis van der Lely
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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Auger-equipped plow
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Patent number 4,295,531
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Issue date Oct 20, 1981
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Hubert E. Strickland
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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2658436
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Patent number 2,658,436
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Issue date Nov 10, 1953
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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2051443
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Patent number 2,051,443
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Issue date Aug 18, 1936
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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1349821
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Patent number 1,349,821
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Issue date Aug 17, 1920
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING