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AUTOMATIC TELEPHONE EXCHANGES; [ MANUAL TELEPHONE EXCHANGES; COMMONBATTERY TELEPHONE EXCHANGES; MAGNETIC TELEPHONE EXCHANGES; ] INTERPHONES; TELEPHONES; KEY TELEPHONES; [ ELECTRICAL KEYS FOR TELEPHONES; SOUND AMPLIFIERS; DIALS; CONNECTORS; CONVERTERS; ] RELAYS; [ ELECTRICAL KEYS; SWITCHES; FACSIMILE TRANSMITTERS; PHOTOTELEGRAPHIC APPARATUS; ] REPEATING EXCHANGES; DATA SIGNAL EXCHANGES [ ; VIDEO RECORDERS; RADIO TRANSMITTERS AND RECEIVERS; FIXED STATION SIMPLEX COMMUNICATION EQUIPMENT; FIXED STATION MULTIPLEX COMMUNICATION EQUIPMENT; VEHICULAR RADIO COMMUNICATION EQUIPMENT; AIRCRAFT RADIO COMMUNICATION EQUIPMENT; PORTABLE RADIO COMMUNICATION EQUIPMENT; TRANSCEIVERS; MACHINERY PRESET REMOTE CONTROL EQUIPMENT ]