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3822106
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Patent number 3,822,106
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Issue date Jul 2, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3561079
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Patent number 3,561,079
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Issue date Feb 9, 1971
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B28 - WORKING CEMENT, CLAY, OR STONE
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3414951
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Patent number 3,414,951
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Issue date Dec 10, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3414470
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Patent number 3,414,470
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Issue date Dec 3, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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3069744
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Patent number 3,069,744
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Issue date Dec 25, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3056183
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Patent number 3,056,183
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Issue date Oct 2, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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3021900
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Patent number 3,021,900
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Issue date Feb 20, 1962
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B28 - WORKING CEMENT, CLAY, OR STONE
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2730783
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Patent number 2,730,783
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Issue date Jan 17, 1956
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B28 - WORKING CEMENT, CLAY, OR STONE
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2612673
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Patent number 2,612,673
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Issue date Oct 7, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2585446
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Patent number 2,585,446
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Issue date Feb 12, 1952
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B28 - WORKING CEMENT, CLAY, OR STONE
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2579801
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Patent number 2,579,801
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Issue date Dec 25, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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1624191
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Patent number 1,624,191
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Issue date Apr 12, 1927
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B28 - WORKING CEMENT, CLAY, OR STONE