. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . N. PETERS, PNOTO-LITHOGftAPHER, WASHINGTON, D. C. 2 Sheets —Sheet 2. T. A. EDISON. TELEGRAPHIC ALARM AND SIGNAL 186 548. Patented Jan. 23,

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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone