DescriptionScrew propeller (PSF).png English: Line art drawing of a screw propeller Source Archives of Pearson Scott Foresman, donated to the Wikimedia...
DescriptionScrew Propeller (PSF).png English: A device that consists of a central hub with radiating blades placed and twisted so that each forms part...
DescriptionScrew propeller (line art) (PSF S-810014 (cropped)).png Raw image from Pearson Scott Foresman donation Date 7 December 2007, 21:34 (UTC) Source...
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