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3002247
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Patent number 3,002,247
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Issue date Oct 3, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2971239
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Patent number 2,971,239
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Issue date Feb 14, 1961
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B28 - WORKING CEMENT, CLAY, OR STONE
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2810946
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Patent number 2,810,946
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Issue date Oct 29, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2098929
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Patent number 2,098,929
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Issue date Nov 9, 1937
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B28 - WORKING CEMENT, CLAY, OR STONE
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1552478
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Patent number 1,552,478
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Issue date Sep 8, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1531366
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Patent number 1,531,366
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Issue date Mar 31, 1925
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B28 - WORKING CEMENT, CLAY, OR STONE
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1385863
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Patent number 1,385,863
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Issue date Jul 26, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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1369864
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Patent number 1,369,864
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Issue date Mar 1, 1921
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B28 - WORKING CEMENT, CLAY, OR STONE
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1361148
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Patent number 1,361,148
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Issue date Dec 7, 1920
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B28 - WORKING CEMENT, CLAY, OR STONE