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3401669
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Patent number 3,401,669
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Issue date Sep 17, 1968
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B28 - WORKING CEMENT, CLAY, OR STONE
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2929735
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Patent number 2,929,735
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Issue date Mar 22, 1960
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B28 - WORKING CEMENT, CLAY, OR STONE
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2818824
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Patent number 2,818,824
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Issue date Jan 7, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE
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2642030
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Patent number 2,642,030
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Issue date Jun 16, 1953
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B28 - WORKING CEMENT, CLAY, OR STONE
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2577215
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Patent number 2,577,215
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Issue date Dec 4, 1951
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B28 - WORKING CEMENT, CLAY, OR STONE
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2215981
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Patent number 2,215,981
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Issue date Sep 24, 1940
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B28 - WORKING CEMENT, CLAY, OR STONE
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2170610
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Patent number 2,170,610
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Issue date Aug 22, 1939
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B44 - DECORATIVE ARTS
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2165210
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Patent number 2,165,210
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Issue date Jul 11, 1939
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B28 - WORKING CEMENT, CLAY, OR STONE
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1965574
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Patent number 1,965,574
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Issue date Jul 10, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE
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1965573
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Patent number 1,965,573
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Issue date Jul 10, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE