SigAlert system was invented in Los Angeles in 1955 by Loyd C. "Sig" Sigmon

1. SigAlert system was invented in Los Angeles in 1955 by Loyd C. "Sig" Sigmon. Sigmon was an executive VP of a broacasting company and had worked on non-combat radio communications in U.S. Army's Signal Corps during WWII. He wanted to make a better way for LAPD to communicate accidents and server jams. Prior to this system, stations would individually call the LAPD, talking to officers who had to repeat the same information to each caller. The LAPD agreed to the use of the SigAlert system as long as Sigmon did not keep it exclusively for his own radio station.