TELEPHONES, BATTERY RINGING
INTERCOMMUNICATION (Common Return)
The case is of pressed steel, finished smooth black and equipped with press-button combined ringing and selecting switches, hand micro-telephone, call buzzer, etc.
The desk instruments are also fitted with a flexible multiple cable and a terminal rosette.
This type of instrument can also he supplied with the case constructed of
polished walnut, mahogany or other hard wood, if required.
Taken from the Siemens Brothers Catalogue 1928
Last revised: February 26, 2022