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History
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An IFF test set used by a United States Air Force avionics technician technical sergeant for testing transponders on aircraft
An IFF test set used by a United States Air Force avionics technician technical sergeant for testing transponders on aircraft
Radar coverage of the Chain Home system, 1939–40
Radar coverage of the Chain Home system, 1939–40
Code generator from German WW II IFF-Radio FuG 25a Erstling
Code generator from German WW II IFF-Radio FuG 25a Erstling
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A Highway 407 toll transponder
A Highway 407 toll transponder
A transponder in a private plane squawking 2000
A transponder in a private plane squawking 2000