Telegraph Abbreviations and Acronyms

  1. AT
    American Telephone
  2. CT
    Colombo Delegraph
  3. DI
    Droam Industries
  4. ORT
    Order of Railroad Telegraphero
  5. PTT
    Postal, Telepraph, and Telephone
  6. PTT
    Postes, TéLéGraphes, TéLéPhones
  7. TAC
    Telegraph Apparatus Company

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