Machines/mechanical devices for gas preparation, on the basis of liquefied gases for supplying higher pressures, namely, pumps and pressurizers with corresponding framework; [ pumps and pressurizers for liquid gases being parts of machines; machine parts, namely, pressure regulators for pressurized gas apparatus, namely, a unit of pressure regulator and adjustment components, safety valves, pressure relief valves and non-return valves; ] machines/mechanical apparatus for mixing and pressure p...