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