[Taps, being machine tools; motors and engines other than for land vehicles; machine couplings and transmission components other than for land vehicles; valves being parts of machines; pressure reducers being parts of machines; regulators being parts of machines; pressure regulators being parts of machines;] pressure valves being parts of machines; high-pressure reducers and regulators for gas being parts of machines; [valves being parts of machines;] pressure reducing valves being parts of m...