File:US1657641-figure-1.png

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Description free piston engine
Date
Source https://patents.google.com/patent/US1657641A/en?oq=us1657641
Author Pescara Raul Pateras
Permission
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Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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Date/TimeThumbnailDimensionsUserComment
current16:48, 18 July 2021Thumbnail for version as of 16:48, 18 July 20211,914 × 1,320 (90 KB)MichaelFrey (talk | contribs)crop and rotate
16:38, 18 July 2021Thumbnail for version as of 16:38, 18 July 20212,320 × 3,408 (71 KB)MichaelFrey (talk | contribs){{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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