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

Chuck Guzis cclist at sydex.com
Sat May 12 17:37:03 CDT 2018


My guess was MADRE or NRL:

https://www.wikiwand.com/en/Over-the-horizon_radar

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.

--Chuck


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