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2552163
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Patent number 2,552,163
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Issue date May 8, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2464235
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Patent number 2,464,235
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Issue date Mar 15, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2445126
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Patent number 2,445,126
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Issue date Jul 13, 1948
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B28 - WORKING CEMENT, CLAY, OR STONE
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2344312
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Patent number 2,344,312
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Issue date Mar 14, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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2213047
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Patent number 2,213,047
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Issue date Aug 27, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2176893
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Patent number 2,176,893
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Issue date Oct 24, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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2065827
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Patent number 2,065,827
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Issue date Dec 29, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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2038276
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Patent number 2,038,276
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Issue date Apr 21, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1996209
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Patent number 1,996,209
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Issue date Apr 2, 1935
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B28 - WORKING CEMENT, CLAY, OR STONE
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1914713
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Patent number 1,914,713
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Issue date Jun 20, 1933
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B28 - WORKING CEMENT, CLAY, OR STONE
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1851242
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Patent number 1,851,242
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Issue date Mar 29, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1838952
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Patent number 1,838,952
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Issue date Dec 29, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1794373
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Patent number 1,794,373
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Issue date Mar 3, 1931
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B28 - WORKING CEMENT, CLAY, OR STONE
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1714601
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Patent number 1,714,601
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Issue date May 28, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1683417
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Patent number 1,683,417
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Issue date Sep 4, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1568653
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Patent number 1,568,653
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Issue date Jan 5, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE