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3892516
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Patent number 3,892,516
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Issue date Jul 1, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3881856
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Patent number 3,881,856
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Issue date May 6, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3873058
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Patent number 3,873,058
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Issue date Mar 25, 1975
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B28 - WORKING CEMENT, CLAY, OR STONE
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3856254
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Patent number 3,856,254
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Issue date Dec 24, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3844524
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Patent number 3,844,524
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Issue date Oct 29, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3804361
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Patent number 3,804,361
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Issue date Apr 16, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3792832
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Patent number 3,792,832
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Issue date Feb 19, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3758067
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Patent number 3,758,067
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Issue date Sep 11, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3744184
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Patent number 3,744,184
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Issue date Jul 10, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3743235
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Patent number 3,743,235
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Issue date Jul 3, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3739050
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Patent number 3,739,050
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Issue date Jun 12, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3724805
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Patent number 3,724,805
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Issue date Apr 3, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE