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    Re: Aircraft position when you first hear it
    From: David Iwancio
    Date: 2021 Oct 13, 07:27 -0700

    Antoine:

    I would not be surprised if some of your questions have already been answered by militaries in the 1930's and 1940's, before the widespread use of radar.  There might be training materieals for air defense crews from around that time.

       
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