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Color coded tools
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Patent number 4,982,627
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Issue date Jan 8, 1991
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Ken A. Johnson
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Magnetic ball thrust bearing
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Patent number 4,303,281
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Issue date Dec 1, 1981
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Holcomb B. Irby
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Twirl quill drill
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Patent number 4,166,488
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Issue date Sep 4, 1979
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Holcomb B. Irby
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2915926
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Patent number 2,915,926
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Issue date Dec 8, 1959
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR