1947 February 20 USA, California, Los Angeles, South of Downtown, Pico Blvd./Stanford Ave.: a blast at the O'Connor Electroplating Company destroyed/damaged more than 55 structures in a 300-foot radius, 150 people were injured and 15 persons perished. The incident resulted in the city's first ordinance stipulating regulations for the storage, transportation, production, processing, and use of hazardous chemicals and led to one of the first Hazmat Dictionary's in the U.S.