Raytheon Company is established in Cambridge.

Originally the American Appliance Company, it is founded by Vannevar Bush, William Gammell Jr., and Laurence Marshall and located initially in Kendall Square. The company initially produces refrigeration technology, then radio tubes in 1925, when it adopts its current name (for the French word ray for a beam of light and the Greek theon from the gods), and subsequently produces missile-defense, munitions, and cybersecurity systems. It moves to Lexington and then Waltham, merges with United Technologies Corp. in 2019, and is now located in Washington D.C..