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3846529
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Patent number 3,846,529
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Issue date Nov 5, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3634916
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Patent number 3,634,916
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Issue date Jan 18, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3526162
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Patent number 3,526,162
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Issue date Sep 1, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3484913
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Patent number 3,484,913
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Issue date Dec 23, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3440907
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Patent number 3,440,907
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Issue date Apr 29, 1969
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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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3257671
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Patent number 3,257,671
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Issue date Jun 28, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE