FURNACE TRANSFORMERS AND RECTIFIER TRANSFORMERS USED IN METALLURGICAL PROCESSES (E.G. IN STEELWORKS, ETC.); DISTRIBUTION TRANSFORMERS USED IN CONNECTION WITH ELECTRICAL DISTRIBUTION NETWORKS RANGING IN OUTPUT SIZE FROM 30 - 2,500 KVA; POWER TRANSFORMERS USED IN HYDROELECTRICAL PLANTS FOR SYSTEM VOLTAGES UP TO 420 KV AND OUTPUTS UP TO 600 MVA; AND HYDROELECTRIC GENERATORS OF ALL TYPES AND SIZES FOR HYDROELECTRICAL POWER STATIONS; TURBO GENERATORS OF ALL TYPES AND SIZES FOR OIL AND GAS POWER STATIONS; AND TELECOMMUNICATION PRODUCTS INCLUDING TELEPHONES; MICROPROCESSORS-CONTROLLED TELEPHONE SETS; MICROPROCESSOR-CONTROLLED AUTOMATIC ALARM SYSTEMS CONNECTED TO TELEPHONE SETS; TELEPHONE EQUIPMENT PARTS, NAMELY LOUDSPEAKERS, CONNECTORS AND DECONNECTORS; TELEFAX AND TELEX MODULES FOR COMPUTERS; PAY-TV SYSTEM PARTS, NAMELY, CENTRAL PROCESSING UNIT FOR HANDLING OF SUBSCRIBER DATA, ENCODER FOR ENCRYPTION OF VIDEO AND DATA SIGNALS; SUBSCRIBER LINE MAINTENANCE SYSTEMS; COMPUTER BASED SYSTEMS FOR OPERATION, MAINTENANCE AND MANAGEMENT OF THE TELECOMMUNICATIONS NETWORKS; CRYPTOGRAPHIC TERMINALS; MICROPROCESSOR CONTROLLED TERMINAL EQUIPMENT FOR ENCRYPTION OF ALPHANUMERICAL TEXT AND DATA; MICROPROCESSOR-CONTROLLED REPEATERS FOR DECODING GYRO TRANSMISSION SIGNALS; TELEMETRY COMMAND CONTROL SYSTEMS; COMPUTERIZED SIGNAL CONTROL AND DATA ALARM-SYSTEMS FOR WATER AND SEWAGE SYSTEMS; CONTROL AND COMMAND COMPUTERIZED ANDSPECIALIZED LAND-MOBILE RADIO-SYSTEMS