telephone exchange office

Analog Telephone Exchange ATX

application for exchange

application for exchange allocation

auto-exchange telephone

automatic telephone exchange

automatic telephone exchange system

BETRS Basic Exchange Telephone Radio Service

capacity of telephone exchange

central office exchange

central office exchange service

central telephone exchange

Central-office Exchange

common battery telephone exchange

computer telephone exchange

concourse-connection longitudinal-transverse auto-telephone exchange

crossbar automatic telephone exchange

crossbar systern automatic telephone exchange

Cultural exchange for east and west