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3536304
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Patent number 3,536,304
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Issue date Oct 27, 1970
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B28 - WORKING CEMENT, CLAY, OR STONE
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3456926
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Patent number 3,456,926
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Issue date Jul 22, 1969
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B28 - WORKING CEMENT, CLAY, OR STONE
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3237925
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Patent number 3,237,925
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Issue date Mar 1, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3228664
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Patent number 3,228,664
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Issue date Jan 11, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE
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3168296
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Patent number 3,168,296
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Issue date Feb 2, 1965
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B28 - WORKING CEMENT, CLAY, OR STONE
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3160400
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Patent number 3,160,400
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Issue date Dec 8, 1964
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B28 - WORKING CEMENT, CLAY, OR STONE
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3069145
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Patent number 3,069,145
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Issue date Dec 18, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3066919
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Patent number 3,066,919
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Issue date Dec 4, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3061283
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Patent number 3,061,283
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Issue date Oct 30, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2901228
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Patent number 2,901,228
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Issue date Aug 25, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2809816
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Patent number 2,809,816
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Issue date Oct 15, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2261207
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Patent number 2,261,207
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Issue date Nov 4, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE