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Old Aug 13, 2013 | 8:12 pm
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Middle_Seat
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Somewhat related invention using a technique patented in 1941 and deployed in 1945 by the Soviet Union. It hung in the US Embassy in Moscow until it was discovered in 1952: http://en.wikipedia.org/wiki/Thing_(listening_device)
Last edited by Middle_Seat; Aug 13, 2013 at 8:31 pm
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