Improvements in the device of double and quadruple telegraphs

Improvements in the device of double and four telegraphs: No. 2069/26.Declared.04/25/1875.Issue 05.24.1878 / Thomas Alva Edison.- [St. Petersburg]: Type.Exped.Zagot.state.papers, 1878. -15 p., 1 l.Il .. -The privilege issued from the Department of Trade and Manufactory in 1878. Foreigner Thomas Alve Edison, for improvement in the device of double and quadruple telegraphs.Before the text: 26.Ex.: With a handle.litter..I. Edison, Thomas Alva 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS