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Concrete form
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Patent number 6,761,345
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Issue date Jul 13, 2004
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Greenstreak, Inc.
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Willy J. Reyneveld
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B28 - WORKING CEMENT, CLAY, OR STONE
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Concrete form
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Patent number 6,195,956
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Issue date Mar 6, 2001
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Willy J. Reyneveld
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B28 - WORKING CEMENT, CLAY, OR STONE