An apparatus for cutting and recovering casing from a well which includes a well string having a swivel mounted thereon, a gripping assembly, a lower drive cone, and a cutter mounted on the lower end of the well string, the swivel functioning as the expander or drive cone for the gripping assembly to...http://www.google.de/patents/US4047568?utm_source=gb-gplus-sharePatent US4047568 - Method and apparatus for cutting and retrieving casing from a well bore
