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3668498
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Patent number 3,668,498
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Issue date Jun 6, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Patent number 3,356,918
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Issue date Dec 5, 1967
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G05 - CONTROLLING REGULATING
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Patent number 3,280,659
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Issue date Oct 25, 1966
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3238430
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Patent number 3,238,430
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Issue date Mar 1, 1966
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G05 - CONTROLLING REGULATING
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR