pdf Automatic Telephone Exchange Systems Popular
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30mar_GPO_AutomaticTelephoneExchangeSystems.pdf
March 1930. His Majesty's Stationery Office. Part 14B. Rural Automatic Exchanges - 25/100 lines, using units, Auto, No. 5 - Installation and Maintenance. British Post Office UAX5. About 28MB. Contributed by Paul Coxwell.
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