Telephone Systems-Namely, Pabx's, Line Concentrators, Emergency Telephone Communication Systems for Highways, Intercommunication Apparatus; Telephone Instruments-Namely, Automatic- and LB-Desk and Wall Telephones, Field Telephones, Lightweight Headsets; Data-Processing and Transmission Systems-Namely, Time Division Multiplexers (TDM) and Frequency Division Multiplexers (FDM); Electronic Low Frequency Equipment for Telecommunications-Namely, Modems; Remote and Local Control, Monitoring and Tel...