Warren Automatic Tool Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4367477 Rate of penetration recorderExpiredMay 06, 81Jan 04, 83[G01D, E21B]
4355784 Method and apparatus for controlling back pressureExpiredAug 04, 80Oct 26, 82[F16K]

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