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2804065
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Patent number 2,804,065
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Issue date Aug 27, 1957
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B28 - WORKING CEMENT, CLAY, OR STONE
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2471940
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Patent number 2,471,940
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Issue date May 31, 1949
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2468178
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Patent number 2,468,178
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Issue date Apr 26, 1949
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR