File:US2301667-Figure1.png

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English: Rotary compressor and other engines
User:MichaelFrey/US2301667
Date
Source https://www.google.co.in/patents/US2301667
Author Otto Lutz
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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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current19:21, 9 August 2015Thumbnail for version as of 19:21, 9 August 20151,508 × 1,124 (29 KB)MichaelFrey (talk | contribs){{Information |Description = {{en|1=Rotary compressor and other engines}} {{:User:MichaelFrey/US2301667}} |Source =https://www.google.co.in/patents/US2301667 |Author =Otto Lutz |Date =28. März 1938 |Permission ={{PD-US...

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