1790 - The U.S. Patent Office was opened. The first U.S. patent was issued to Samuel Hopkins of Vermont for a new method of making pearlash and potash. The patent was signed by George Washington and Thomas Jefferson.
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London 2012 Olympics Day 5
http://www.historyorb.com/events/july/31
http://nraombakc.blogspot.in/2012/06/31-july-knowledge-history-science.html
http://en.wikipedia.org/wiki/July_31
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