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3059304
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Patent number 3,059,304
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Issue date Oct 23, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3049784
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Patent number 3,049,784
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Issue date Aug 21, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3014260
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Patent number 3,014,260
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Issue date Dec 26, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2822599
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Patent number 2,822,599
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Issue date Feb 11, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2818628
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Patent number 2,818,628
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Issue date Jan 7, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2723436
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Patent number 2,723,436
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Issue date Nov 15, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2633441
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Patent number 2,633,441
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Issue date Mar 31, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2345072
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Patent number 2,345,072
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Issue date Mar 28, 1944
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B28 - WORKING CEMENT, CLAY, OR STONE
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1979626
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Patent number 1,979,626
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Issue date Nov 6, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1863839
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Patent number 1,863,839
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Issue date Jun 21, 1932
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B28 - WORKING CEMENT, CLAY, OR STONE
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1786753
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Patent number 1,786,753
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Issue date Dec 30, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1747192
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Patent number 1,747,192
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Issue date Feb 18, 1930
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B28 - WORKING CEMENT, CLAY, OR STONE
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1697422
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Patent number 1,697,422
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Issue date Jan 1, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1697435
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Patent number 1,697,435
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Issue date Jan 1, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1697423
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Patent number 1,697,423
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Issue date Jan 1, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1697434
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Patent number 1,697,434
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Issue date Jan 1, 1929
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B28 - WORKING CEMENT, CLAY, OR STONE
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1673269
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Patent number 1,673,269
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Issue date Jun 12, 1928
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B28 - WORKING CEMENT, CLAY, OR STONE