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3760789
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Patent number 3,760,789
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Issue date Sep 25, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3395204
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Patent number 3,395,204
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Issue date Jul 30, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3265056
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Patent number 3,265,056
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Issue date Aug 9, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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2951475
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Patent number 2,951,475
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Issue date Sep 6, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2815745
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Patent number 2,815,745
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Issue date Dec 10, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2712307
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Patent number 2,712,307
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Issue date Jul 5, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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578116
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Patent number 578,116
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Issue date Mar 2, 1897
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B28 - WORKING CEMENT, CLAY, OR STONE
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337661
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Patent number 337,661
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Issue date Mar 9, 1886
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B28 - WORKING CEMENT, CLAY, OR STONE
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200593
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Patent number 200,593
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Issue date Feb 19, 1878
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B28 - WORKING CEMENT, CLAY, OR STONE