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Heavy-duty live centers
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Patent number 3,987,693
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Issue date Oct 26, 1976
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Henry F. Swenson
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2730917
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Patent number 2,730,917
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Issue date Jan 17, 1956
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2437957
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Patent number 2,437,957
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Issue date Mar 16, 1948
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2342054
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Patent number 2,342,054
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Issue date Feb 15, 1944
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2116135
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Patent number 2,116,135
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Issue date May 3, 1938
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1768734
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Patent number 1,768,734
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Issue date Jul 1, 1930
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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1491332
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Patent number 1,491,332
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Issue date Apr 22, 1924
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR