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Document from 1955 - UltraSonic telephone wire taps
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17-11-2022, 13:50
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Dude111
An Awesome Dude
Join Date: Mar 2009
Posts: 3,868
A good read....... Shows in 1955 they had the technology to tap a phone EVEN WHEN ON THE HOOK!!
http://cryptome.org/2013/05/ultra-sonic-listening.pdf
Ah man!!
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