On This Day in Telephone History November 21ST 1931 Inauguration of teletypewriter exchange service, TWX, by ATT. Teletypewriters had been in use on private lines since 1915. The new service established central switching exchanges through which any subscriber could communicate by teletypewriter with any of the other subscribers to the service.

On This Day in Telephone History November 21ST 1931

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On This Day in Telephone History November 21ST 1931 Inauguration of Teletypewriter Exchange Service, TWX, by ATT. Teletypewriters had been in use on private lines since 1915. The new service established central switching exchanges through which any subscriber could communicate by teletypewriter with any of the other subscribers to the service.