The Story of Hasler's T200 Telex System
  Link to the T200 Story and Documents Collection (in Dropbox)
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Please note that an Article of the T200 Telex Switching System is available in Wikipedia!
Versions in English, Deutsch, Francais!
Or just GOOGLE for it and be proud!
The first T201 Telex Exchange in Hongkong
Cutover to Service on 2nd February 1972
Switch-off the last T203 System in Lugano
Switch-off on 31st August 2020