Introduction to telephones and telephone systems/

Geahča maid

• Introduction to telephone switching
  Dahkki: 355070 Briley, Bruce E.
• Improvements in telephone signalling /
  Dahkki: 272820 Welch, S.
  Almmustuhtton: (1949)
• The British telephone system : system effectiveness /
  Dahkki: Open University. Systems Behaviour Course Team, et al.
  Almmustuhtton: (1973)
• The telephone and the exchange /
  Dahkki: 462982 Povey, P J
  Almmustuhtton: (1979)
• Electronic Telephone Projects /
  Dahkki: Caristi, Anthony J., author 364284
  Almmustuhtton: (1986)