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3672646
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Patent number 3,672,646
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Issue date Jun 27, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3026094
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Patent number 3,026,094
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Issue date Mar 20, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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1953091
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Patent number 1,953,091
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Issue date Apr 3, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1731953
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Patent number 1,731,953
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Issue date Oct 15, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1379174
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Patent number 1,379,174
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Issue date May 24, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE