• Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System
  • Blue Prints - Telephone Exchange System

Blue Prints - Telephone Exchange System

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$26.00
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This invention relates to telephone exchange systems, and particularly to semi-automatic systems.