A method and apparatus for inspection and control of threaded joint tightening processes by registering over the main part of the tightening process the momentary values of the torque delivered to the joint and the angular displacement of the joint and by comparing these values in a control unit with...http://www.google.com/patents/US4259869?utm_source=gb-gplus-sharePatent US4259869 - Method and apparatus for inspection and fail-safe control of threaded joint tightening processes
