Basic telephone switching systems
Talley, David
Basic telephone switching systems - 2nd ed - Rochelle Park Hayden Book, 1979 - 184 p. 20 cm - .
0-8104-5687-75
Telephone switching systems, Electronic
621.395.65 Tal
Basic telephone switching systems - 2nd ed - Rochelle Park Hayden Book, 1979 - 184 p. 20 cm - .
0-8104-5687-75
Telephone switching systems, Electronic
621.395.65 Tal