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3324601
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Patent number 3,324,601
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Issue date Jun 13, 1967
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2989824
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Patent number 2,989,824
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Issue date Jun 27, 1961
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2810438
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Patent number 2,810,438
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Issue date Oct 22, 1957
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2554830
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Patent number 2,554,830
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Issue date May 29, 1951
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B24 - GRINDING POLISHING
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1384756
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Patent number 1,384,756
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Issue date Jul 19, 1921
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR