7th Jun 2022, 12:58 am
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#5
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Hexode
Join Date: Mar 2009
Location: Minneapolis, Minnesota, USA.
Posts: 279
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Re: Development of the STD (Subscriber Trunk Dialling) system
Vol 51, Part 4 of the Post Office Electrical Engineers' Journal, Jan. 1959 was devoted to STD. See http://www.samhallas.co.uk/repositor...20Dialling.pdf
73 John KC0G/M0KCY
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