37 INSTALLATION, REPAIR AND MAINTENANCE OF ALL OF THE FOLLOWING; MACHINES FOR STERILIZING, DISTILLATION AND MONITORING OF PHARMACEUTICAL PRODUCTS, AS WELL AS FOR FILLING IN BAGS AND BOTTLES AND INSTALLATIONS COMPOSED THEREOF; VAPORIZATION PLANTS; WATER TREATMENT PLANTS* ; * WELDING MACHINES, IN PARTICULAR COVER WELDING MACHINES; STORE TANKS MADE OF SPECIAL STEEL; ALL MACHINES AND INSTALLATIONS FOR USE IN THE PHARMACEUTICAL AND MEDICAL INDUSTRY, NAMELY PURE STEAM GENERATORS, MULTIPLE-EFFECT DISTILLATION UNITS, DISTILLATION UNITS, HEAT EXCHANGERS, STERILIZERS, HOT WATER SPRAYING [ STERILIZES, ] * STERILIZERS, * STEAM STERILIZERS ETO STERILIZERS, CLEAN AND PURE WATER SYSTEMS FOR STERILE APPLICATIONS, CAP WELDING MACHINES FOR POLYETHYLENE BOTTLES, PURE STEAM SYSTEMS, PREPARATION AND STORAGE SYSTEMS FOR STERILE SOLUTIONS, MULTIPLE-EFFECT DISTILLATION SYSTEMS, CIP/SIP SYSTEMS, CIP UNITS, AND BOTTLE WASHING MACHINES