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3810726
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Patent number 3,810,726
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Issue date May 14, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3284850
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Patent number 3,284,850
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Issue date Nov 15, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2641042
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Patent number 2,641,042
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Issue date Jun 9, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2641041
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Patent number 2,641,041
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Issue date Jun 9, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2377668
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Patent number 2,377,668
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Issue date Jun 5, 1945
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B28 - WORKING CEMENT, CLAY, OR STONE
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2301379
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Patent number 2,301,379
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Issue date Nov 10, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2131562
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Patent number 2,131,562
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Issue date Sep 27, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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2118552
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Patent number 2,118,552
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Issue date May 24, 1938
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B28 - WORKING CEMENT, CLAY, OR STONE
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2044234
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Patent number 2,044,234
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Issue date Jun 16, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1981265
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Patent number 1,981,265
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Issue date Nov 20, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1960773
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Patent number 1,960,773
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Issue date May 29, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1732238
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Patent number 1,732,238
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Issue date Oct 22, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1674197
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Patent number 1,674,197
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Issue date Jun 19, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE
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1588018
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Patent number 1,588,018
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Issue date Jun 8, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1399338
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Patent number 1,399,338
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Issue date Dec 6, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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1377525
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Patent number 1,377,525
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Issue date May 10, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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1332693
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Patent number 1,332,693
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Issue date Mar 2, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE
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1004062
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Patent number 1,004,062
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Issue date Sep 26, 1911
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B28 - WORKING CEMENT, CLAY, OR STONE
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897596
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Patent number 897,596
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Issue date Sep 1, 1908
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B28 - WORKING CEMENT, CLAY, OR STONE