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- 5.0 (dbd:second)
- Citizen analog-digital chronograph with 4 area radio time signal reception and radio-controlled synchronization (en)
- First quartz wristwatch movement, Caliber 35A, Seiko, Japan, 1969 (en)
- First European quartz clock for consumers "Astrochron", Junghans, Schramberg, 1967 (en)
- A basic analog quartz clock (en)
- Modern quartz wristwatch (en)
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