Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)
United States. Bureau of the Census, Steuart, William Mott, 1861-, Martin, Thomas Commerford, 1856-1924, Abbott, Arthur Vaughan, 1854-, Mayer, William · Washington : Govt. Print. Off. · leaf 172
1, Automatic repeater: l, automatic line tester; 3, multiple pen register; 4, manual dial transmitter. … vuxrvff^vmy. 1 Relay switchboard; 2, joker board; 3, working switcbboard; 4, multiple pen register; 5, automatic line tester.TELEGRAPHIC DEPARTMENT, FIRE ALARM HEADQUARTERS, WASHINGTON, D. C, 1902. 130 TELEPHONES AND TELEGRAPHS. Table 7.—ELECTEIO FIEE ALARM STATE OR TEKRITOEY. Num-ber ofsys-tems.…
Telephone · Telegraph · Fire alarms
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