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3377000
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Patent number 3,377,000
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Issue date Apr 9, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3053519
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Patent number 3,053,519
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Issue date Sep 11, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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1823270
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Patent number 1,823,270
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Issue date Sep 15, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1726812
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Patent number 1,726,812
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Issue date Sep 3, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE