International Time Division Multiplex (TDM) Telegraph Systems - Maintenance of International Telegraph, Phototelegraph and Leased Circuits - Maintenance of International Public Telephone Network - Maintenance of Maritime Satellite and Data Transmission S
International Time Division Multiplex (TDM) Telegraph Systems - Maintenance of International Telegraph, Phototelegraph and Leased Circuits - Maintenance of International Public Telephone Network - Maintenance of Maritime Satellite and Data Transmission S