REPLY AND CALL TELEPHONE
Wall pattern battery reply call telephone, comprising "Manchester" shot transmitter, electro magnetic watch receiver, trembler bell (25 ohm) automatic switch hook, auto resetting ring key and impedance coil.
These telephones are specially designed for use with GEC Intercom Telephones where it is desired that certain offices shall be able to ring and speak both ways to a central station, but not to intercommunicate.
They have no induction coils and are made of polished walnut wood with all the external metal
work having an oxidised finish.
Cost in 1926 was £3.0.0
Last revised: February 01, 2011