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Gear-cutting machine
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Patent number 9,868,169
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Issue date Jan 16, 2018
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MITSUBISHI HEAVY INDUSTRIES MACHINE TOOL CO., LTD.
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Toshimasa Kikuchi
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Method and apparatus for working a hole
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Patent number 4,129,028
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Issue date Dec 12, 1978
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Grumman Aerospace Corporation
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Basil P. Leftheris
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3709093
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Patent number 3,709,093
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Issue date Jan 9, 1973
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2930248
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Patent number 2,930,248
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Issue date Mar 29, 1960
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR