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Auxiliary drill handle
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Patent number 10,689,966
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Issue date Jun 23, 2020
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Libero Mazzone
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Cutting tool wear monitor
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Patent number 4,786,220
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Issue date Nov 22, 1988
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Borg-Warner Corporation
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John M. Fildes
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Drill break-through sensor
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Patent number 4,310,269
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Issue date Jan 12, 1982
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Northrop Corporation
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Horst W. Neu
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2379182
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Patent number 2,379,182
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Issue date Jun 26, 1945
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR