Fil:Axial piston pump US2956845 page 1.png

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Beskrivning
English: Patent USPTO No. 2956845, drawing, page 1 (13), showing an axial piston pump, type swash plate, with spherical shaped piston heads and piston ring.
Datum Patent application, filed at USPTO May 9, 1956. Patent granted October 18, 1960
Källa Wahlmark patent US2956845, 1960, page 1
Skapare Gunnar A. Wahlmark, Rockford, Illinois USA.
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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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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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nuvarande15 september 2009 kl. 17.49Miniatyrbild för versionen från den 15 september 2009 kl. 17.491 904 × 2 736 (104 kbyte)Lidingo{{Information |Description={{en|1=Patent USPTO No. 2956845, drawing, page 1, showing an axial piston pump, type swash plate, with spherical shaped piston heads and piston ring.}} |Source=[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p

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