7 Equipment for use in drilling, completing and/or producing oil and gas wells, namely, hydraulic linear actuators, pneumatic linear actuators, pistons, clutches, and collets; gas diverters consisting of a pump, storage and refilling tank, pre-heater, vaporizer, recuperator, condenser and valves for diverting the flow of drilling fluid in a riser pipe beneath a production platform; well tools for suspending casing within a well, namely, subsea and surface wellheads, mudline hangers and connectors for tying mudline hangers back to a production platform at the water surface; subsea wellhead systems including their major components, namely, wellhead housings, permanent guide bases, casing hangers, seal assemblies, and wear bushings; wellhead connectors and seal rings therefor for use on subsea wellheads; valves and valve actuators for installation on oil well drilling and completion equipment