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3219307
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Patent number 3,219,307
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Issue date Nov 23, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3019505
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Patent number 3,019,505
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Issue date Feb 6, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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1948989
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Patent number 1,948,989
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Issue date Feb 27, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE