I worked for ARINC Aeronautical Radio INC down at FAA HQ. ARINC was the engineering company hired by the Government a long time ago to assess the aviation requirements for tube electronics, mostly radios which as fate would have it were still in abundant use by the Airline industry and the FAA as late as 1986 when solid state radios replaced them. ARINC developed standards for avionics and when I was there was involved in all aspects of Aviation industry communications systems.
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