File:Axial piston pump US2956845 page 1.png

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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.
Date Patent application, filed at USPTO May 9, 1956. Patent granted October 18, 1960
Source Wahlmark patent US2956845, 1960, page 1
Author 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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current15:49, 15 September 2009Thumbnail for version as of 15:49, 15 September 20091,904 × 2,736 (104 KB)Lidingo (talk | contribs){{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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