Re: When was the No 12 dial introduced
Atkinson's 'Telephony, Vol: 1' refers to a 'new type of dial in which the slipping cam has been eliminated' and refers to it as the trigger dial. There is no mention of it being 'Dial, No:12' but there is a photograph and it has the number 12 stamped on it.
This book was first published in 1948.
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Regds,
Russell W. B.
G4YLI.
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