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 258
high as seven digits on the decimal basis. In some cases theremay be one more digit for party line stations. In the effort to reduce themental labor of remembering the call number long enough to dial it, theydevised the plan of spelling out the first two or three letters of the officename, which… … Key Springs Hartied jX fo ma He before 50w> Req.CD. I I Reserve \_i Comm.toPos.. I-fal switchboard of the Dean Electi
Telephone
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