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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:48, 18 July 2021 | ![]() | 1,914 × 1,320 (90 KB) | MichaelFrey | crop and rotate |
16:38, 18 July 2021 | ![]() | 2,320 × 3,408 (71 KB) | MichaelFrey | {{Information |Description=free piston engine |Source= https://patents.google.com/patent/US1657641A/en?oq=us1657641 |Date= 31. Jan. 1928 |Author= Pescara Raul Pateras |Permission= {{PD-US-patent-no notice}} |other_versions= <gallery> image:US1657641-figure-1.png file:US1657641-figure-2.png </gallery> }} category:Free-piston engines |
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