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Precision placement spreader
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Patent number 5,947,391
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Issue date Sep 7, 1999
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The Louis Berkman Company
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Glenn M. Beck
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Precision placement spreader
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Patent number 5,842,649
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Issue date Dec 1, 1998
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The Louis Berkman Company
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Glenn M. Beck
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES