F
irst U.S. patent issued; granted to inventor Samuel Hopkins for a potash process.
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Today In History- July 31
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Created:Feb 14, 2008
Modified: Jul 19, 2011
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Fold3, Today In History- July 31 (https://www.fold3.com/memorial/2494/today-in-history-july-31/facts : accessed May 5, 2024), database and images, https://www.fold3.com/memorial/2494/today-in-history-july-31/facts