Fascinating Documentary about Quartz crystal manufacturing
Quartz crystal manufacturing - State-side during WWII.
Note well: the super-clean conditions; the preponderance of PPE; the massive automation; the extensive safety precautions etc. etc. ..... NOT!!!!
https://youtu.be/b--FKHCFjOM
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Red to red, black to black. Throw the switch and stand well back!
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