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One plug system for a snowplow
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Patent number 6,256,909
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Issue date Jul 10, 2001
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The Louis Berkman Company
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James A. Kost
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Plug system for a snowplow
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Patent number 6,138,388
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Issue date Oct 31, 2000
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The Louis Berkman Company
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James A. Kost
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES