First-Hand:The First Quartz Wrist Watch Assembling Crew - Engineering and Technology History Wiki
The Quartz Watch is 50 Years Old - CMM Magazine
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clocks, quartz clock, Swissonic 2000 by Ebauches AG und Centre Electronique Horloger, 1972, Additional-Rights-Clearences-Not Available Stock Photo - Alamy
History of the First Quartz Wristwatch — The World's First Quartz Wristwatch
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