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3822336
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Patent number 3,822,336
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Issue date Jul 2, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3185748
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Patent number 3,185,748
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Issue date May 25, 1965
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B44 - DECORATIVE ARTS
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2917801
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Patent number 2,917,801
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Issue date Dec 22, 1959
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B28 - WORKING CEMENT, CLAY, OR STONE
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2855653
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Patent number 2,855,653
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Issue date Oct 14, 1958
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B28 - WORKING CEMENT, CLAY, OR STONE