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On this day: July 31

POSTED: 08:36 PM PDT Jul 30, 2012 UPDATED: 11:00 PM PDT Jul 30, 2012

Mt. Fuji erupts, the Apollo 15 astronauts go for a ride and major-league baseball players end their strike, all on this day.

OTD July 31 - US patent — 4 / 34

Public domain

1790: The very first U.S. patent is issued to inventor Samuel Hopkins for his process to refine potash.

OTD July 31 - Mount Fuji

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OTD July 31 - US patent

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