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3909600
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Patent number 3,909,600
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Issue date Sep 30, 1975
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3790875
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Patent number 3,790,875
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Issue date Feb 5, 1974
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G05 - CONTROLLING REGULATING
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3496747
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Patent number 3,496,747
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Issue date Feb 24, 1970
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3439346
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Patent number 3,439,346
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Issue date Apr 15, 1969
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G05 - CONTROLLING REGULATING