found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

Ed Sharpe couryhouse at
Sat May 12 21:36:01 CDT 2018

not these heads.....

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On Saturday, May 12, 2018 Chuck Guzis via cctalk <cctalk at> wrote:
My guess was MADRE or NRL:

The timing would be right. Acoustic delay lines served the same
purpose, but you couldn't have a mercury delay line in an airplane,
practically speaking.


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