73378313
Aug 5, 1982
Jun 5, 1984
Electrical Power Supplies, Power Converters and Rectifiers; Uninterruptable Electrical Power Units and Apparatus; Electrical Power Apparatus and Controls for Telephone Exchanges; Telecommunication Ringing and Signalling Equipment Comprising Ringing and Tone Generators and Interrupters; Units and Apparatus for Testing and Monitoring Telephone and Communication Lines and Circuits; Multichannel and Single Channel Telecommunication Carrier Apparatus and Units for Creating Additional Communication Channels on Existing Lines; Repeaters and Amplifiers for Use in Telecommunication Lines; Apparatus for Protecting Electrical Lines from Overvoltage and Overcurrent Comprising Protectors, Arresters, High Voltage Insulators; Electric Wire and Cable Connectors and Distribution Fittings Comprising Clamps, Caps, Clip Insulators, Clips, Deadends, Splices and Sleeves; Electrical Terminals; Distribution Frames; Electrical Closures for Communication; Power and CATV Cables; Apparatus for Treating Both Voice and Data Communication Signals on Telephone Lines; Credit Card Telephone Pay Stations; Key Telephone Sets and Parts Thereof
Electrical and Scientific Apparatus