Solid state cathode ray direction finder for air traffic control, CE254, by E. K. Cole & Co., 1980-1990. Solid State Cathode Ray Direction Finder for Air Traffic Control 1980-1990
Cathode ray direction finder for air traffic control, CE178, by E. K. Cole & Co., 1952-1957. Cathode ray direction finder for air traffic control 1952-1957