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2348945
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Patent number 2,348,945
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Issue date May 16, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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1963952
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Patent number 1,963,952
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Issue date Jun 26, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1766552
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Patent number 1,766,552
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Issue date Jun 24, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1702102
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Patent number 1,702,102
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Issue date Feb 12, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1702224
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Patent number 1,702,224
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Issue date Feb 12, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1665517
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Patent number 1,665,517
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Issue date Apr 10, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1665518
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Patent number 1,665,518
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Issue date Apr 10, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1443788
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Patent number 1,443,788
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Issue date Jan 30, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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1394160
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Patent number 1,394,160
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Issue date Oct 18, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE