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3232826
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Patent number 3,232,826
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Issue date Feb 1, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3016597
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Patent number 3,016,597
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Issue date Jan 16, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2569538
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Patent number 2,569,538
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Issue date Oct 2, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE