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CEH and the Beta 21: The History of the First Swiss Quartz Watch - Grail Watch
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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
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FORRER (Max) et al. - L'aventure de la montre à quartz. - Livre Rare Book
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