Bilde: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.

Public domain 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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