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DICTOGRAPH DICTOMATIC OFFICE SWITCHBOARD, 1950's
The Dictograph Company was formed in 1902 with the first surveillance room bugging device.
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- Model is a HL20/1A substation. It is an internal office telephone & not a switchboard, as such.The 20 = that the phone has 20 connections,A = that the phone is capable of connecting to an automatic telephone system, the 1 = that it has a connection to a single master station. A 52way cable(Actually 55 wires) was used to connect the individual sub stations. Superceded in the early 60's by the DHL20/1A.
.......... Mike Williams, Droitwich, Worcs, 30th of December 2015