7 parts of machines for oil and gas well drilling, fracturing, stimulation, production and flow processing systems, namely, christmas trees, wellheads, tubing heads, tubing hangers and casing hangers; pumps for oil and gas well drilling, fracturing, stimulation, production and flow processing; truck, trailer and skid-mounted pumps for oil and gas well drilling, fracturing, stimulation, production and flow processing; manifolds for oil and gas well drilling, fracturing, stimulation, production and flow processing; truck, trailer and skid-mounted manifolds for oil and gas well drilling, fracturing, stimulation, production and flow processing; parts of machines for oil and gas well drilling, fracturing, stimulation, production and flow processing, namely, flow control valves, gate valves, plug valves, check valves, and butterfly valves; power operated pneumatic, electric and hydraulic valve actuators; parts of machines for oil and gas well drilling, fracturing, stimulation, production and flow processing, namely, pressure relief valves, chokes, choke manifolds, and choke and kill manifolds; electrical, hydraulic, and electro-hydraulic controls for operating machines in the nature of oil and gas well drilling, fracturing, stimulation, production and flow processing systems; hydraulic power units; separation equipment for separating oil, gas, water and/or solids from well fluids, namely, cyclone separators, gravity separators, settling tanks, horizontal separators, vertical separators, inline separators, deliquidizers, degassers, phase splitters, demisters, coalescers, desanders, dewaterers, hydrocyclones and flotation units; desanders, namely, machines for separating sand and particulates from well fluids; swivel joints being parts of machines; articulated frac arms being parts of machines; articulated frac arm manifolds being parts of machines; automatic greasing systems for valves; seal assemblies being parts of machines; packoffs being parts of machines