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MECHANICAL COMPONENTS OF ELECTRONIC EQUIPMENT COMPRISING ELECTRONIC HARDWARE, EQUIPMENT HOUSINGS AND MOUNTINGS; ELECTRONIC ASSEMBLIES FOR POWER SUPPLY IN COMMUNICATION UNITS IN AEROSPACE VEHICLES, FOR CONNECTING COMPUTERS TO RECORDERS, AND ELECTRICAL INSTRUMENT COMPONENTS FOR AIRCRAFT, ANTENNAS AND COMPONENTS AND ANTENNA SYSTEMS, MODULES AND RACKS FOR AUTOMATIC PILOTS AND ELECTRICAL NAVIGATION UNITS, MECHANICAL FRAMES AND SUB-ASSEMBLIES OF ELECTRONIC EQUIPMENT FOR SPACE VEHICLES; [ WELDED CIRCUIT BOARDS, ] ELECTRONIC POWER SUPPLY MODULES, AND ELECTRONIC AMPLIFIERS AND PREAMPLIFIERS