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Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US395579828 Nov 197311 May 1976Groupement pour les Activities Atomiques et Avancees "GAAA"Guiding and positioning device for the block and hook of a derrick on a ship
US432674530 Jun 198027 Apr 1982Guier and Affiliates, Inc.Link control system for use with dual elevators
US439631114 Oct 19802 Aug 1983Carrier unit
US445388420 Aug 198212 Jun 1984Zena Equipment, Inc.Hook rotating mechanism
US47919977 Jan 198820 Dec 1988Vetco Gray Inc.Pipe handling apparatus and method
US479342216 Mar 198827 Dec 1988Hughes Tool Company - USAArticulated elevator links for top drive drill rig
USRE2956514 Oct 19757 Mar 1978Western Gear CorporationDrill string heave compensator and latching apparatus