MACHINES FOR THE PRODUCTION AND CHEMICAL TREATMENT OF PRINTED CIRCUIT BOARDS AND METALLIC SHAPED PARTS, NAMELY ETCHING MACHINES, RESIST STRIPPING MACHINES, RINSING MACHINES, RESIST DEVELOPING MACHINES; MACHINES FOR THE REGENERATION OF CHEMICAL SUBSTANCES USED WITH THE ABOVE MENTIONED GOODS; MACHINE PARTS FOR THE ABOVE MENTIONED GOODS, NAMELY FILING AND EXHAUST PUMPS