 The company underwent a successful public offering of its common stock underwritten by Hambrecht & Quist in the mid 1970s with shares thereafter trading on the NASDAQ exchange.In 1978 a merger was consummated with TRW Inc. to merge ESL with TRW, the latter being a large defense contractor in the USA.In 2001, TRW sold the real estate of the ESL campus in Sunnyvale, CA.