This was sent to Jean Lentin by Frank..thanks Frank!!!!! I knew I
wasn't imagining it!!
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I can't tell you where it is but if you can get to Popular mechanics old
copies database of articles.. they have it. also rex research had
copies.may have one in my files yep can't believe i found it.
see french journal ACUSTICA vol. 17 1966 no 1
would love to have an english translation. my copy is in french. if you
can't get it will fax it to you. infrasonic rectifier shield also in
french 71.01731 believe this is patent number also has 2.122.312 jan
1971 also has number 1.536.289
enough references that it should get you there. would sure appreciate a
translation of both
frank hartman
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