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3659583
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Patent number 3,659,583
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Issue date May 2, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3462130
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Patent number 3,462,130
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Issue date Aug 19, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3327874
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Patent number 3,327,874
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Issue date Jun 27, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3319807
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Patent number 3,319,807
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Issue date May 16, 1967
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B28 - WORKING CEMENT, CLAY, OR STONE
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3207330
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Patent number 3,207,330
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Issue date Sep 21, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE