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3459409
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Patent number 3,459,409
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Issue date Aug 5, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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2464523
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Patent number 2,464,523
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Issue date Mar 15, 1949
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B28 - WORKING CEMENT, CLAY, OR STONE
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2048913
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Patent number 2,048,913
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Issue date Jul 28, 1936
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B28 - WORKING CEMENT, CLAY, OR STONE
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1969533
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Patent number 1,969,533
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Issue date Aug 7, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1622294
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Patent number 1,622,294
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Issue date Mar 29, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE
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1611297
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Patent number 1,611,297
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Issue date Dec 21, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1577218
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Patent number 1,577,218
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Issue date Mar 16, 1926
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B28 - WORKING CEMENT, CLAY, OR STONE
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1455898
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Patent number 1,455,898
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Issue date May 22, 1923
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B28 - WORKING CEMENT, CLAY, OR STONE
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975847
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Patent number 975,847
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Issue date Nov 15, 1910
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B28 - WORKING CEMENT, CLAY, OR STONE
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944399
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Patent number 944,399
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Issue date Dec 28, 1909
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B28 - WORKING CEMENT, CLAY, OR STONE
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920958
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Patent number 920,958
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Issue date May 11, 1909
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B28 - WORKING CEMENT, CLAY, OR STONE
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921480
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Patent number 921,480
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Issue date May 11, 1909
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B28 - WORKING CEMENT, CLAY, OR STONE
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858017
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Patent number 858,017
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Issue date Jun 25, 1907
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B28 - WORKING CEMENT, CLAY, OR STONE
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829561
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Patent number 829,561
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Issue date Aug 28, 1906
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B28 - WORKING CEMENT, CLAY, OR STONE
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787441
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Patent number 787,441
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Issue date Apr 18, 1905
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B28 - WORKING CEMENT, CLAY, OR STONE
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490631
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Patent number 490,631
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Issue date Jan 24, 1893
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B28 - WORKING CEMENT, CLAY, OR STONE
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409560
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Patent number 409,560
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Issue date Aug 20, 1889
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B28 - WORKING CEMENT, CLAY, OR STONE