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 82
FIG. 1.—SMALL MAGNETO SWITCHBOARD. FIG. 2.—REAR VIEW OF MAGNETO SWITCHBOARD.
Telephone · Telegraph · Fire alarms
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