[Milsurplus] USN Type PJ Soundscriber disc recorder in WW2

[Nick England]

Does anyone know about typical use of the type PJ Soundscriber audio disc
recorder in WW2? I have found one interesting reference here -

https://www.ibiblio.org/hyperwar/USN/ref/RADELEVEN/GCMS/index.html

Thanks,
Nick England K4NYW
www.navy-radio.com
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