76136849
Sep 27, 2000
Mar 23, 2004
Downhole completion system for oil and gas wells in the nature of power operated tools and machines used to drill and complete well bores, namely wellhead plugs, pressure and safety valves, packers, plugs, seals, liner hangers, bore receptacles, sleeves, nipples, chokes, running and retrieving tools, and rotary drilling swivels
Machinery