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2717147
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Patent number 2,717,147
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Issue date Sep 6, 1955
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B28 - WORKING CEMENT, CLAY, OR STONE
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2281329
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Patent number 2,281,329
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Issue date Apr 28, 1942
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B28 - WORKING CEMENT, CLAY, OR STONE
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2244765
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Patent number 2,244,765
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Issue date Jun 10, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE
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2237957
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Patent number 2,237,957
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Issue date Apr 8, 1941
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B28 - WORKING CEMENT, CLAY, OR STONE