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Multi-bit drill
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Patent number 5,882,152
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Issue date Mar 16, 1999
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Bernhard M. Janitzki
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Wear resistant tools
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Patent number 5,580,196
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Issue date Dec 3, 1996
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Habit Diamond Limited
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Michael F. Thompson
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Cemented carbide drill
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Patent number 4,971,485
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Issue date Nov 20, 1990
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Sumitomo Electric Industries, Ltd.
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Toshio Nomura
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Coated hard metal tool
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Patent number 4,643,620
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Issue date Feb 17, 1987
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Sumitomo Electric Industries, Ltd.
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Hiroshi Fujii
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abrasive bodies
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Patent number 4,457,765
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Issue date Jul 3, 1984
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William I. Wilson
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR