TELECOMMUNICATION EQUIPMENT COMPRISING TRANSMISSION SYSTEMS; NAMELY, MICROWAVE RADIO TRANSMITTERS AND RECEIVERS AND PROTECTION SWITCHING UNITS THEREFOR, MICROWAVE RADIO REPEATERS, FIBER OPTIC TRANSMISSION UNITS, MULTIPLEX UNITS, CABLE CARRIER UNITS, SUBSCRIBER CARRIER SYSTEMS DATA TRANSMISSION UNITS, PULSE CODE MODULATION UNITS, SUPERVISORY CONTROL UNITS, ECHO SUPPRESSORS AND SIGNALING UNITS; CENTRAL OFFICE SYSTEMS; NAMELY, TELEPHONE SWITCHING UNITS, PRIVATE AUTOMATIC BRANCH EXCHANGEES, STATION EQUIPMENT; NAMELY, TELEPHONE SETS CORD CONNECTORS, COIN CONTROLLER TELEPHONE SETS, INTERCOMS, AND TELEPHONE ANSWERING MACHINES; AND TELEPHONE AND TELEPHONE LINE TESTING INSTRUMENTS
Electrical and Scientific Apparatus