Electrodes of metal for electrical monitoring and measuring of corrosion, electrical probes of metal for measuring corrosion, electrical flush probes, supports and inserts for such probes for use in measuring corrosion and erosion; cathodic anodes for the prevention of electrolytic corrosion; test stations comprising computers, transmitters and probes for testing and measuring corrosion; electrical fluid sampling and flow fittings; electronic safety clamps, safety barriers, and valves for cor...

Equipment and Fittings for Pressure Fluid Systems-Namely, Access Fittings, Covers, Thread Protectors, Seat Protectors and Adapters for Access Fittings, Crosses and T's, Casing and Tubing Head Spools, Mandrels, Back Pressure Valves, Bonnets and Flanges, Wellheads and Parts Thereof and Attachments Therefor, Cathodic Anodes for the Prevention of Electrolytic Corrosion, Fluid Sampling and Flow Equipment, Fracturing Heads, and Retrievers and Attachments Therefor for Use with Access Fittings