Apparatus for aerating water; Centrifugal pumps; Drain cocks; Faucets being parts of machines, engines or motors; Heat exchangers being parts of machines; Hydraulic valve actuators; Parts of oilfield wellhead machines, namely, gate valves, ball valves, check valves, plug valves, globe valves, choke and manifold industrial pumps, pump and valve parts, pipe fittings and flanges; Piston rings; Piston rings being engine parts; Pressure reducers as parts of machines; Pressure regulators being parts of machines; Pumps for machines; Regulators being parts of machines; Steam engine boilers; Taps being parts of machines, engines or motors; Vacuum pumps; Valves being parts of machines; Air craft piston engine cylinder assemblies; Back pressure valves as parts of machines; Dispensing valves being machine parts; Industrial machine presses; Oil-water separators for pneumatic controls being part of machines