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3027693
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Patent number 3,027,693
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Issue date Apr 3, 1962
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3018591
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Patent number 3,018,591
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Issue date Jan 30, 1962
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1891279
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Patent number 1,891,279
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Issue date Dec 20, 1932
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B24 - GRINDING POLISHING
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1778977
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Patent number 1,778,977
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Issue date Oct 21, 1930
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B24 - GRINDING POLISHING
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1691898
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Patent number 1,691,898
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Issue date Nov 13, 1928
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B24 - GRINDING POLISHING