. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . •«* PHOTO-LITHOGRAPHIC CO. .J. Y. I OSBOHKtS AM, PHQTO-LITHOGRAPHIC CO, HY ( OSSORNeS^HQCCSS- / THOMAS A. EDISON. 4 Sheetsmprovement in Telegraph Apparatus. No. 123,005, Patented Jan. 23, 1872.

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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone