75871962
Dec 10, 1999
Power-operated tools, which may be remotely controlled, for down hole oil, gas or injection wells, namely, packers; Parts of gas and oil well completion machines, which may be remotely activated, namely, safety valves, sliding sleeves, controlled fluid and gas flow control valves, and safety valves
MachineryElectronic flow control devices, namely, safety valves and sliding sleeves, for use in down hole oil, gas, and injection wells
Electrical and Scientific Apparatus