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Here's a link that talks about the WW2 rubber
coated german U boat coated to try and defeat radar. http://uboat.net/technical/electroboats3.htm
And another link about the rubber coated U boat
that says the rubber coating helped defeat sonar as well. http://www.history.navy.mil/branches/org12-5.htm
Seems there were only 10 of these
made.
Kindest Regards,
Bill Akins.
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