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From a survey of the literature, Seiko has used two methods:
1. In 1996, Seiko published one method involving a spring and a viscous damper:
"we adopted a method in which a third wheel, whose gear and pinion are elastically connected by a coil spring, and a fourth wheel, whose rotational load is applied by the viscous resistance of grease, are installed in the gear train"
The spring…
Seiko's technology for battery-powered clocks with sweeping seconds
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