Manually operated metal valves for use in oil and gas wells to regulate the flow of fluid, namely, gate valves, check valves, and pipeline valves; manually operated metal valves for use in storage, cavern, and thermal wells to regulate the flow of fluid, namely, gate valves, check valves, and pipeline valves; metal hardware items for use in wellheads, namely, casing heads, casing spools, casing hangers, tubing heads, tubing hangers, tubing head adapters, crosses and tees, casing caps, and primary and secondary packoffs; metal hardware items for use in wellheads, namely, adapter spools, top connectors, and tree assemblies; metal hardware items for use in wellheads and valves, namely, nuts; metal flanges

Wellheads in the nature of machinery for use in oil and gas wells; wellheads in the nature of machinery for use in storage, cavern, and thermal wells; valves in the nature of machinery to regulate the flow of fluid, namely, gate valves, check valves, and pipeline valves; parts of wellhead machinery, namely, primary and secondary packoffs in the nature of a seal for a wellhead, o-rings; lubricators, namely, a hydraulically or mechanically operated tool mounted at the top of a wellhead and used to install or remove wellhead parts in a high pressure wellhead; all the aforesaid being machines or parts of machines

Christmas trees in the nature of an assembly of valves, spools, and fittings, affixed to a wellhead to control well production or injection through the use of pressure sensors and pressure gauges, for use in oil and gas wells; Christmas trees in the nature of an assembly of valves, spools, and fittings, affixed to a wellhead to control well production or injection through the use of pressure sensors and pressure gauges, for use in storage, cavern, and thermal wells; surface safety valves for use in oil and gas wells; surface safety valves for use in storage, cavern, and thermal wells; electric surface and subsurface safety valve control panels; automatic valves for use in oil and gas wells, namely, gate valves, check valves, and pipeline valves for safety use; automatic valves for use in storage, cavern, and thermal wells, namely, gate valves, check valves, and pipeline valves for safety use; emergency shut down valves for automatic or remote flow shutoff to control pressure and flow to maintain safe conditions, for use in oil and gas, storage, cavern, and thermal wells; control panels used to monitor, operate, and control the flow and pressure in equipment for use in oil and gas, storage, cavern, and thermal wells; metal test plugs in the nature of testing apparatus for use in wellhead equipment

Installation, repair and maintenance of equipment, machinery, and parts thereto, for oil and gas, storage, cavern, and thermal wells