Telecommunications Equipment-Namely, Multi-Frequency Remote Recall Units and Adapter-Intercom Units; Carrier Detector, Modulator and Demodulator Units for Digitized Data and Voice Signals; Pulse Code Modulated Carrier Systems-Namely, Channel Banks, Logic Units, Encoders, Decoders and Repeaters; Telecommunication Switching Systems-Namely, Private Branch Exchanges, Central Offices, Community Dial Offices, Automatic Call Distributors, Command and Control Stored Program Based Switching Controller...