Staber, E..
Approach to Testing and Maintaining Telephone Exchanges and Networks / Staber E.. - Zurich : Standard Telephon und Radio AG, 1987. - 80 s.: il.; 25 cm.
Approach to Testing and Maintaining Telephone Exchanges and Networks / Staber E.. - Zurich : Standard Telephon und Radio AG, 1987. - 80 s.: il.; 25 cm.