Apparatus for applying torque to a first tubular relative to a second tubular, the apparatus comprising a first tong for gripping the first tubular and a second tong for gripping the second tubular, wherein the first tong is provided with teeth around a peripheral surface thereof, the second tong is...http://www.google.es/patents/US20020157823?utm_source=gb-gplus-sharePatente US20020157823 - Wrenching tong
