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Covering artificial leg
The U.S. patent system allows other inventors to improve the original design

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The Artificial Leg is Invented
November 4, 1846

A patent is a legal document giving an inventor full rights over his or her own creation. The Patent Act of 1790 created this system. It allows the American government to give patents for new inventions. Anyone who creates something can apply for a patent. Anyone who improves an existing object can also apply for a patent. A patent protects the inventor from being copied. Have you invented anything that no one else has?
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