Bush, Stanley E.
Private Branch Exchange Systems and Applications Stanley E. Bush and Charles R. Parsons - New York: McGraw Hill, 1993. - x, 192p.
HB
Eng
007007062
Telephone-Private branch exchanges
621.385 / BUP
Private Branch Exchange Systems and Applications Stanley E. Bush and Charles R. Parsons - New York: McGraw Hill, 1993. - x, 192p.
HB
Eng
007007062
Telephone-Private branch exchanges
621.385 / BUP