April 10, 1790 – The U.S. patent system is established.
The story of the United States Patent and Trademark Office
C 21.2:P27/3/981 Federal Documents
« This Day in History: April 9, 1865
» This Day in History: April 11, 1951
« This Day in History: April 9, 1865
» This Day in History: April 11, 1951
» This Day in History: April 11, 1951
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This Day in History: April 10, 1790
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