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Document from 1955 - UltraSonic telephone wire taps

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#1 Afterm4th

Afterm4th

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Posted 30 May 2013 - 07:45 PM

http://cryptome.org/...c-listening.pdf

 

 

Worth a read. Shows that the FBI had the technology in 1955 to tap a phone even when it was on the hook using ultrasonic frequencies.

 

 

talk about old school






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