For those interested in the historical aspects, mid 50s in this instance, of
crystals and crystal oscillators in radio equipment...
https://worldradiohistory.com/BOOKSHELF-ARH/Tube-Technology/Handbook-of-Piezoelectric-Crystals-John-P-Buchanan-1956-(701-pages).pdf
Even a few of them there 3 legged solid state thingies managed to sneak in an
earlyish appearance:-)
Season's greetings to all
Nigel GM8PZR
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