Basic telephone switching systems /
Talley, David.
Basic telephone switching systems / David Talley. - N.J. : Hayden Book Co., c1980. - 184 p. : ill. ; 25 cm.
Includes index.
Telephone systems.
Telephone, Automatic.
621.3857
Basic telephone switching systems / David Talley. - N.J. : Hayden Book Co., c1980. - 184 p. : ill. ; 25 cm.
Includes index.
Telephone systems.
Telephone, Automatic.
621.3857