Improvements in the device of drilling tools

Improvements in the device of drilling tools: No. 1756/69.Declared.05/27/1874.Issue 11/27/1875 / Robert Nobel.- [St. Petersburg]: Type.Exped.Zagot.state.papers, 1876. -6 p., 1 liter.Il .. -The privilege issued from the Department of Trade and Manufactory in 1875 by the Swedish subject Robert Nobel, to improve in the device of drilling tools.Before the text: 69.Ex.: With a handle.litter..I. Nobel, Robert 1.People (collection).Electronic copy source: PBOriginal storage location: VPTB FIPS