Early general radio microwave equipment at the National Electronics Museum [Reverberations]

General Radio (GR) was founded in 1915 with the immediate purpose of manufacturing measuring equipment for use at radio frequencies (RFs). Some of their early standard capacitors found their way into experimental radio equipment built by Edwin H. Armstrong. After the World War I, much of the company's product line was driven by the new radio broadcasting phenomenon. For a short time, the company produced components for use in radio equipment, but, eventually, their main effort went back to producing radio test equipment. The company was first located in Cambridge, Massachusetts, at Massachusetts Avenue and Windsor Street. It maintained facilities at that location until 1958, when operations were moved to Concord.