July 30
July 30, 1863 - Automobile manufacturer Henry Ford was born on his family’s farm in Dearborn, Michigan . His introduction of the assembly line and other mass production techniques revolutionized manufacturing.
President Lyndon Johnson signs the Medicare Act, providing federally-funded health insurance for senior citizens - 1964

Former Teamsters President Jimmy Hoffa disappears. Presumed to be dead, his body has never been found - 1975
United Airlines agrees to offer domestic-partner benefits to employees and retirees worldwide - 1999
Labor history found here:
http://www.unionist.com/big-labor/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_07_30_2011