Historical clue formulations

• Tesla and Edison, famously — 2022-06-19
• Coke and Pepsi, e.g. — 2010-07-19
• Play featuring Mrs. Malaprop, with "The" — 2010-07-04
• Harvard and Yale, e.g. — 2010-01-13
• Competes equally with — 1999-02-16
• Richard Sheridan play, with "The" — 1994-08-24