An apparatus for transferring pipe between pipe racks and the drilling rig floor including a stationary trough located below and extending towards the drilling rig and a movable, inclined trough aligned with the stationary trough having one end supported on the drilling floor and the other end powered...http://www.google.fr/patents/US4474520?utm_source=gb-gplus-shareBrevet US4474520 - Pipe handling machine
