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On this day: May 20

Published On: May 17 2013 04:26:12 PM CDT   Updated On: May 20 2013 01:00:00 AM CDT

Vasco da Gama arrives in India, Christopher Columbus dies, Norman Rockwell makes his Saturday Evening Post cover debut, HIV is discovered, and "Cheers" airs its series finale, all on this day.

OTD May 20 - Levi patent
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U.S. Patent Office

1873: Jacob W. Davis of Reno, Nev., receives a U.S. patent on a rivet process for strengthening the pocket openings of canvas pants. He assigned the patent to himself and Levi Strauss, as his business partner. Davis was in charge of manufacturing when Levi Strauss & Co. opened its two San Francisco factories, with its first riveted clothing being made and sold sometime during 1873. The company was the only one making riveted clothing for nearly 20 years, until the patent expired around 1891.

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