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Prior to the 1978 appearance of Seiko Twin Quartz, the methods used to achieve high accuracy under varying temperatures were limited thermoinsensitivity via megahertz frequency AT-cut oscillators, and analog thermocompensation (analog TC) via some sort of thermovariable capacitor.
This thread is about the latter approach. It may help to read my original introduction in post #2
Highlights:
1. Precursor implementations…
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