Improvements in phonograms and ways to prepare them

Improvements in phonograms and methods of their preparation: No. 5277/21.Declared.05/10/1888 Issues 12.03.1893 / Thomas Alva Edison, George Eduard Guro.- [St. Petersburg]: Type.V. Kirshbauma, 1893. -8 s .. -The privilege issued from the Department of Trade and Manufactory in 1892 to foreigners Thomas Alve Edison and George Eduard Guro, to improve in phonograms and ways to prepare them.Before the text: 21.Ex.: With a handle.litter..I. Guro, George Edward.II.Edison, Thomas Alva.1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS