Re: When was the No 12 dial introduced?
The trigger dial photo in 'Atkinson' has 12 C44/1 stamped on it. 1944 manufacture?
'The Telephone Handbook' by Herbert and Proctor was written in 1944 and it only mentions slipping cam dials; doesn't even mention the number 10. So given the inertia of publishing, I would guess 1944 to 1948 as the dates for development and rolling-out.
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Regds,
Russell W. B.
G4YLI.
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