ELECTRO-TECHNICAL APPARATUS, INSTRUMENTS AND DEVICES; TELECOMMUNICATION AND TELEPHONE SWITCHING SYSTEMS FOR WIREBOUND AND WIRELESS OPERATION AND APPARATUS THEREFOR, AUTOMATIC OR MANUALLY OPERATED COMMUNICATIONS EXCHANGES OR SUB-EXCHANGES, TELEPHONE SUBSCRIBER STATION APPARATUS, LOUDSPEAKING DEVICES ALONE AND IN COMBINATION WITH TELEPHONE-INTERCONNECTING FACILITIES, INTERCOMMUNICATION AND CONFERENCE SPEAKING DEVICES, HIGH-SPEED SPEAKING DEVICES,CONFERENCE DEVICES ALONE OR IN CONNECTION WITH ELECTRIC RECORD PLAYERS; SIGNAL DEVICES, PARTICULARLY ALARM DEVICES; CARRIER-CURRENT DEVICES, SWITCHING DEVICES, REPEATERS AND FILTERS FOR ELECTRIC WAVES, COILS, INCLUDING LOADING COILS, MODULATORS AND DEMODULATORS, OSCILLATORS, RECTIFIERS, VOLTAGE REGULATORS, CATHODE PROTECTING DEVICES, ELECTRIC CONVERTERS, GASFILLED AND VACUUM TYPE DISCHARGE TUBES, BATTERIES, TRANSISTORS, CONDENSERS AND CONDENSER BANKS; BARE AND INSULATED ELECTRIC CABLES, LINES OR LEADS, CORDS, STRANDS AND WIRES, FITTINGS FOR ELECTRIC CABLE AND LINE INSTALLATIONS; ELECTRICALLY OPERATED DATA PROCESSING DEVICES; ELECTRICAL CALCULATORS AND COMPUTERS, PROGRAMMING CONTROL DEVICES; ELECTRICALLY CONTROLLED MATERIALS HANDLING SYSTEMS AND APPARATUS THEREFOR-NAMELY, PNEUMATIC TUBE SYSTEMS, BELT-CONVEYOR SYSTEMS, ELECTRICALLY CONTROLLED SORTING MECHANISMS FOR CARD-INDEX SHEETS, CARDS, LETTERS, PACKAGES OR FILES; COMPONENT PARTS OF THE AFOREMENTIONED APPARATUS, AND ELECTRICALLY OPERATED AUTOMATIC BOOKING MACHINES