Material treatment services, namely, weld cladding, surfacing, facing and overlay to protect metal and metal components from corrosion; machining of metals; welding, electroplating, galvanizing, laminating of pipes, pipe fittings, pipe bends, pipe joints, elbows of metal for pipes, pipe junctions,pipe reinforcements, and of valves, namely, manual and actuated gate valves, ball valves, check valve, and fluid control valves, all made wholly or predominantly of metal, and of machined metal components, namely, metal screws, extrusion screw flights, pump components, wellhead equipment, blow out preventers, and of replacement parts for all of the foregoing; metal plating, metal treating, and metal tempering; manufacturing services, namely, the custom manufacture to the specification and order of others of pipes, pipe fittings, pipe bends, pipe joints, elbows of metal for pipes, pipe junctions, pipe reinforcements, and of valves, namely, manual and actuated gate valves, ball valves, check valves, and fluid control valves, all made wholly or predominantly of metal, and of machined metal components, namely, metal screws, extrusion screw flights, pump components, wellhead equipment, blow out preventers, and of replacement parts for all of the foregoing