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3476669
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Patent number 3,476,669
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Issue date Nov 4, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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2928561
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Patent number 2,928,561
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Issue date Mar 15, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2869843
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Patent number 2,869,843
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Issue date Jan 20, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2353487
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Patent number 2,353,487
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Issue date Jul 11, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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1349813
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Patent number 1,349,813
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Issue date Aug 17, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE