D. Edward Mitchell 16:00, 14 April 2020 (UTC) Hello World! groupKOS Developer Share —usually UNDER CONSTRUCTION
Quartz Crystals
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- HARNESSING NATURE’S TIMEKEEPER: A HISTORY OF THE PIEZOELECTRIC QUARTZ CRYSTAL TECHNOLOGICAL COMMUNITY (18801959)
Stack Exchange
- Quartz oscillator using a large irregular (natural) piece of quartz crystal for maximum Q?
How to cut, polish, mount, tune quartz resonators
- Crystal Control for Amateur Transmitters —1925 (PDF)