21 ELECTRICAL AND ELECTRONIC SWITCHES, CIRCUIT BREAKERS, COILS, INTERPHONES, TIME PROGRAMME CONTROLLERS, PROGAMME TIMERS, MICROMOTORS, SWITCHBOARD SETS, TIME AND CONTROL SWITCHES, REGULATORS, VALVES, DISTRIBUTORS, RELAYS, CONVERTERS, REMOTE CONTROLS, DETECTORS FOR DETECTING THE PRESENCE OF ELECTRICAL AND ELECTRONIC SIGNALS