The ThingThe Thing, also known as the
Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal.
(wikipedia) In 1946, Soviet school children presented a two foot wooden replica of the Great Seal of the United States to Ambassador Averell Harriman.
The Ambassador hung the seal in his office in Spaso House. During George F. Kennan’s ambassadorship in 1952, a routine security check discovered that the seal contained a microphone and a resonant cavity which could be stimulated from an outside radio signal.
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