VACUUM COATING MACHINES AND PARTS THEREOF; MACHINES FOR TREATING SURFACES BY A LOW-PRESSURE PLASMA PROCESS, NAMELY, VAPOR DISPOSITION MACHINES, CATHODIC EVAPORATION MACHINES, ION-IMPLANTATION MACHINES; MACHINES FOR GLOW-DISCHARGE SUPPORTED DISPOSITION OF HARD AND WEAR-RESISTANT COATINGS; MACHINES COMBINING THE AFORESAID MACHINES; VACUUM CHAMBERS; VACUUM PUMPS; VACUUM BRUSHINGS, NAMELY, CABLE INLETS, HIGH-VOLTAGE CABLE INLETS, MECHANICAL BUSHINGS AND CONDUITS FOR LIQUIDS AND GASES VIEWING CHAM...