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Centre électronique horloger — Wikipédia
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
FORRER (Max) et al. - L'aventure de la montre à quartz. - Livre Rare Book
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IEEE Milestone:Pioneering Work on the Quartz Electronic Wristwatch, 1962-1967 - Engineering and Technology History Wiki
CEH – Beta 21 – Omega Prototypes
Feature: When Rolex Flirted With Quartz | Watchfinder & Co.
René LeCoultre, a Swiss Pioneer of the Quartz Watch, Has Died - Worn & Wound
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Centre Electronique Horloger | Invention & Technology Magazine
