Thread: quartz crystals
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Old 03-06-2019, 09:57 AM
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Quote:
Originally Posted by mr_fixer View Post
I found old QST magazine advertisements from 1932 for quartz and tourmaline crystals for ham transmitters here. http://www.bliley.net/XTAL/docs/ads.html
That helps explain why the 1943 film was not classified.
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