Apparatus for stabbing well casing to join casing sections to each other, including a rotary table assembly for supporting a casing section in a well bore, a derrick over the rotary table assembly, a crown block at the top of the derrick, a first piston and cylinder subassembly pivotally mounted on one...http://www.google.com.au/patents/US4440220?utm_source=gb-gplus-sharePatent US4440220 - System for stabbing well casing
