File:1917-Rosenzweig-53.png

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1917-Rosenzweig-53.png ‎(731 × 177 pixels, file size: 209 KB, MIME type: image/png)

Summary

Helicopter patents in Rosenzweig, 1917, Systematic collection of patents issued in Russia, p. 36. (VPTB.)

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current20:51, 6 February 2024Thumbnail for version as of 20:51, 6 February 2024731 × 177 (209 KB)LTA (talk | contribs)Helicopter patents in Rosenzweig, 1917, Systematic collection of patents issued in Russia, p. 36. (VPTB.)

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