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Old 13th Mar 2021, 11:23 am   #2
Pellseinydd
Heptode
 
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 615
Default Re: GEC Loudspeaking telephone

More info about the GPO version (produced by GEC) at https://britishtelephones.com/lst2.htm

Circuit diagrams of GPO version available to Telecoms Heritage Group members via BT Archives
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