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On May 20, 1873, Levi Strauss and Jacob Davis were granted U.S. Patent No. 139121 for “improvement in fastening pocket openings,” a clever way to reinforce trousers using copper rivets. These durable pants were originally designed for miners and laborers during the American West’s gold rush, but they eventually evolved into the iconic blue jeans worn by everyone from cowboys to catwalk models. This date marks the birth of one of fashion’s most democratic garments.