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Letters for digits in UK telephone numbers
How were STD codes assigned to UK telephone exchanges originally? It turns out they were in alphabetical order...
to exchange history phone retrotech std uk ...
on 12 September 2017
A History of Engineering and Science in the Bell System Switching Technology (1925-1975)
Extensive history of automatic exchanges in the Bell System. Lots of other US telecoms history documentation here too.
to exchange history retrotech telecom telephone ...
on 01 December 2013
by Adam Sampson.