Dubilier Condenser Company
The Dubilier Condenser Company was the earliest commercial manufacturer of electronic capacitors, formerly known as condensers, which were widely used in early radio receivers (wireless sets). The company was founded in New York in 1920, by William Dubilier, who was responsible for many early developments in the field of electronics and radio, including the use of mica in capacitors. Dubilier was a name commonly found on capacitors in early wireless sets in Britain alongside TCC, Wima, and others.
-  History Link.org