Standard time and frequency signal service (STFS): In the United States, standardtime and frequency signals, broadcast on very precise carrier frequencies by the U.S. Naval Observatory and the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS).
... in Korea retreat toward Manchuria followed by 100,000 Japanese troops.
April 30 - Louisiana Purchase Exposition World's Fair opens in Saint Louis, Missouri (closes ...