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Screwpropellor.jpg(215 × 210 pixels, file size: 9 KB, MIME type: image/jpeg)
Description Selected out of original Wiki image by Gerald Zuckier.
Date before 14:37, 2. Jul. 2005
Source en:Image:Screwpropellor.JPG Detail of Bushnell's Turtle picture, showing hand-cranked screw propellors for vertical and horizontal propulsion. Detail of Bushnell's Turtle picture
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, taken or made as part of an employee's official duties.

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