Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 203
ranch Exchange.—This is atype of private branch exchange which has been developed and used to alarge extent in San Francisco, which, especially at certain seasons of theyear has a large tourist population. For the accommodation of familiesof tourists this city contains many family hotels or… … Pu%iutton i-iniLamp mn: In^rt StrapY.f it °PCfa1ori LmeSwCkH9285 I OperatorsMCkt.-IKT5 a Desired to Put DisconnectSupervision and Rdttse UnderControl of PA. X. OperatorFio. 172.—Circuits from manual exchange to PA X. (PaeingP PRIVATE AUTOMATIC EXCHANGE 185 generally be very small and in fact almost…
Telephone
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