7 chemical, petroleum, and oil field treatment, processing, and handling machines and machine parts, namely, oil and gas separators, [ emulsion treaters, ] [regenerators,] [ desulfurizers, absorbers, stabilizers, ] free water knockouts, [oil skimmers,] hydrocarbon recovery units [, pipeline scrubbers,] [ blow cases, flow splitters, degassifiers, reciprocating pumps and coalescers ]