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English: 10 page patent by Wright brothers of their key first airplane
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Source Google patents US821393
Author Orville Wright, Wilbur Wright

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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, 1924.

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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. PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Wright-Patent-US-821393.pdf

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