>Here is something interesting relating to the Norris phase conjugate
>method of producing sound at a distance. Apparently, the sound only
>appears when it impacts the target...you could have GREAT FUN with
>this one....<g>..;
>
>http://www.nas.net/~raven1/acouhetr.gif..
>
>http://www.atcsd.com/HTML/whitepaper.html
>
>
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