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The earliest Radiation hardware known to still exist is the "Force Amplifier", several examples of which were purchased on E-Bay by Nancye Meyers, a Radiation memorabilia collector at Harris Corporation. The amplifier is pictured in a Radiation brochure dating to about 1955. The same brochure states "Radiation Inc... developed and are producing a Servo Force Measuring System This equipment was designed to measure and indicate directly the forces applied by the pilot to the various control surfaces of an aircraft in flight. The indicator is house in a standard instrument case and is normally installed in a photorecorder panel where readings are photographed as desired.." A later paragraph in the same brochure probably refers to the same equipment: "...design and production of the S-6 servometer system for the flight test of aircraft. The complete system provides accurate dial indication of tension and compression forces as applied to aircraft rudder pedals, and wheels or stick assemblies. These highly accurate servo amplifiers may be used with many different types of pickups and transducers." The amplifier contains three vacuum tubes: 6U8 triode-pentode 12AX7 dual triode 6AQ5 power pentode The earliest contract was AF04(611)-424 with Edwards AFB and was assigned JA 1040 under Ralph Johnson. Other systems were built for the Navy (P.O. 1-2278-55, JA1052) and North American Aviation (P.O. H-562-A-33566, JA 1053), presumably for installation in other aircraft. These JA's were assigned to Fred Cullman in Orlando. The most challenging aspect of these programs was installation of the sensors and other equipment in the existing aircraft.