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3218044
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Patent number 3,218,044
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Issue date Nov 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3136434
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Patent number 3,136,434
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Issue date Jun 9, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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2565792
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Patent number 2,565,792
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Issue date Aug 28, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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1855420
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Patent number 1,855,420
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Issue date Apr 26, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1745174
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Patent number 1,745,174
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Issue date Jan 28, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE