Improvement in methods and devices for the work of electric light

Improvements in methods and devices for the work of electric light: No. 2589/89.Declared.12/22/1878.Issue 09.24.1881 / Thomas Alva Edison.- [St. Petersburg]: Type.Exped.Zagot.state.papers, 1881. -10 p., 1 l.Il .. -The privilege issued from the Department of Trade and Manufactory in 1881. Foreigner Thomas Alve Edison, to improve in the methods and devices for the work of electric light.Before the text: 89.Ex.: With a handle.litter..I. Edison, Thomas Alva 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS