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File:Wheelaxle quackenbos.gif

Wheelaxle_quackenbos.gif ‎（350 × 336 像素，檔案大細：23 KB ，MIME類型：image/gif）

描述
English: Wheel & Axle, A Simple Machine
Español: Torno, una máquina simple
日期
來源 A natural philosophy: embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in every-day life
the English language Wikipedia (log)
作者 George Payn Quackenbos
uploaded to Wikipedia by Jimbowley
許可
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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Wheelaxle_quackenbos.gif
File:Wheelaxle quackenbos.svg is a vector version of this file. It should be used in place of this GIF file when not inferior.
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