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3218045
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Patent number 3,218,045
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Issue date Nov 16, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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1753831
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Patent number 1,753,831
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Issue date Apr 8, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1665519
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Patent number 1,665,519
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Issue date Apr 10, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1456877
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Patent number 1,456,877
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Issue date May 29, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE