Interesting 1943 film "Crystals go to War"
https://www.youtube.com/watch?v=wHenisSTUQY
Steve WD8DAS
[email protected]
http://www.wd8das.net/
http://af4k-crystals.com
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Radio is your best entertainment value.
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Mein Ohr ganz nah am Weltempfänger
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