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Plastic moldboard plow
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Patent number 6,564,479
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Issue date May 20, 2003
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The Louis Berkman Company
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Robert V. Vickers
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Plastic moldboard plow
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Patent number 6,134,813
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Issue date Oct 24, 2000
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The Louis Berkman Company
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Robert V. Vickers
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES