. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . N-PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, 0 0,. 2 Sheets—Sheet 2. T. A. No. 221,957. Patented Nov. 25, 1879.

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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone