Chlorobromomethane is a chemical that was invented in Germany in the mid-1940s, created as a slightly less toxic alternative to carbon tetrachloride. It was in use in many different types of fire extinguishers for over twenty years, until 1969, when it was officially banned by the NFPA. It was used primarily in aircrafts, as many of the extinguishers carrying it were portable and able to be stored in tight spaces.