No. U 134
Automatic Telephone, with Two-way Push Button Switch for Ringing and Speaking to Two Positions, such as Maidís Room upstairs and Butlerís Room downstairs. Also for use in Hotels where it is required that Visitors may ring to the Servery or the Office. Suitable for Ringing outwards only.
The act of pressing either Push Button rings the Bell and Switches the Telephone on to the Line required.
Taken from the Sterling Catalogue No. 11 & 12
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