Gilfillan Brothers, later known as ITT-Gilfillan, was an American electronics company located in Los Angeles, best known for their radar systems.
During World War I they produced platinum points for automobile ignition systems and branched out to aircraft parts.
Beginning in 1942, during World War II, the company was selected to build the precision approach radar (PAR) systems that had been developed at the MIT Radiation Laboratory.
These were installed at Royal Air Force airfields beginning 1944 and became a must-have item for bombers returning from missions over Germany.
In the post-war era they began expanding their product line, initially with new ATC systems.