Re: Radio Taxis (1947)
I think you've got it: one close-up of the car radio shows a 'selector' switch like the one shown for the control-box you linked to, and the PTC104 base-station shown in the movie looks like the one shown on the pyetelecomhistory site too.
The oldest Pye gear I worked on was the vibrator-PSU 'Ranger' series - popular with the Forestry Commission on 87MHz! Totally obsolete by the mid-70s when I saw them still in use.
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