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3612491
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Patent number 3,612,491
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Issue date Oct 12, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3167307
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Patent number 3,167,307
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Issue date Jan 26, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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2926796
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Patent number 2,926,796
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Issue date Mar 1, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2703227
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Patent number 2,703,227
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Issue date Mar 1, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2467588
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Patent number 2,467,588
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Issue date Apr 19, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2327473
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Patent number 2,327,473
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Issue date Aug 24, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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2322900
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Patent number 2,322,900
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Issue date Jun 29, 1943
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B28 - WORKING CEMENT, CLAY, OR STONE
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2234210
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Patent number 2,234,210
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Issue date Mar 11, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE