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3723245
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Patent number 3,723,245
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Issue date Mar 27, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3573163
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Patent number 3,573,163
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Issue date Mar 30, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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2972378
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Patent number 2,972,378
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Issue date Feb 21, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2818824
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Patent number 2,818,824
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Issue date Jan 7, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2753766
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Patent number 2,753,766
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Issue date Jul 10, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2732296
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Patent number 2,732,296
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Issue date Jan 24, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2731889
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Patent number 2,731,889
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Issue date Jan 24, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2723599
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Patent number 2,723,599
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Issue date Nov 15, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2667107
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Patent number 2,667,107
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Issue date Jan 26, 1954
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B28 - WORKING CEMENT, CLAY, OR STONE