Persbergs gruvor. Järngruva.Tubledning för hydrauliska kompressorn. Gammal konstgång och spelhus. Public domain photograph of a compressor engine, free to use, no copyright restrictions image - Picryl description
In album: Views in the Ural Mountains, survey of industrial area, Russian Empire, LOT 10335-A, no. 117. Credit line: Prokudin-Gorskiĭ photograph collection, Library of Congress, Prints and Photographs Division. More