Improvements in the device of electromagnetic telegraphs

Improvements in the device of electromagnetic telegraphs: No. 671. Issues on 05/28/1859 / "Siemens and Galsk".- [B.M .: B. and., 1859].-LXXVIII-LXXXV S., 7 l.Il .. -[From different news.Dep.II.Prince.X. 1859].The privilege issued on May 28, 1859, for 10 years, to foreigners of Siemens and Galsk for improvements in electromagnetic telegraph devices.Ex.: With a handle.litter..I. Siemens and Galsk, firm 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS