Traffic control telephone systems

Geahča maid

• The telephone and the exchange /
  Dahkki: 462982 Povey, P J
  Almmustuhtton: (1979)
• 100 years of telephone switching /
  Dahkki: 304488 Chapuis, R. J., et al.
  Almmustuhtton: (2003)
• A small telephone exchange /
  Dahkki: 440802 Mohd. Nasir A. Rahman
  Almmustuhtton: (1985)
• 100 Years of telephone switching (1878-1978)
  Dahkki: 205216 Chapuis, Robert J.
• On-line telephone traffic monitoring /
  Dahkki: 235457 Lee, Cheng Siong
  Almmustuhtton: (1981)