Image:Screwpropellor.jpg
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From en:Image:Screwpropellor.JPG Detail of Bushnell's Turtle picture, showing hand-cranked screw propellors for vertical and horizontal propulsion. Selected out of original Wiki image by Gerald Zuckier.
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This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration. |
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