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Hydraulic drill unit
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Patent number 4,157,231
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Issue date Jun 5, 1979
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The United States of America as represented by the Secretary of the Air Force
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Joseph L. Phillips
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G05 - CONTROLLING REGULATING
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3716949
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Patent number 3,716,949
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Issue date Feb 20, 1973
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3691357
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Patent number 3,691,357
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Issue date Sep 12, 1972
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G05 - CONTROLLING REGULATING
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3665279
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Patent number 3,665,279
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Issue date May 23, 1972
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G05 - CONTROLLING REGULATING
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3364340
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Patent number 3,364,340
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Issue date Jan 16, 1968
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G05 - CONTROLLING REGULATING
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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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3103614
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Patent number 3,103,614
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Issue date Sep 10, 1963
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G05 - CONTROLLING REGULATING