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3523997
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Patent number 3,523,997
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Issue date Aug 11, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3276092
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Patent number 3,276,092
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Issue date Oct 4, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3200177
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Patent number 3,200,177
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Issue date Aug 10, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3070867
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Patent number 3,070,867
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Issue date Jan 1, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE
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2397728
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Patent number 2,397,728
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Issue date Apr 2, 1946
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B28 - WORKING CEMENT, CLAY, OR STONE
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2299072
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Patent number 2,299,072
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Issue date Oct 20, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE