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Quartz watch and battery clock.

After World War II, battery clock manufacturing factories were founded in various places. This accelerated the electrification of the clock.
In addition, the wristwatch also began to advance the trend of electrification. Hamilton developed a battery watch, and Bulova released a watch that uses the vibration of a tuning fork. This tuning fork watch is also a battery type wristwatch. A quartz watch come up afterwards. Seiko put a leading pillar on this, followed by Switzerland and the United States.


第二次世界大戦後、電池時計の製造工場が各地に設立された。これにより時計の電化は加速した。
また、腕時計も電化の傾向を進み始めた。ハミルトンが電池腕時計を開発し、ブローバが音叉時計を発売した。音叉時計も電池式腕時計である。その後、水晶時計が登場する。これにはセイコーが先鞭をつけ、スイスやアメリカも追随した。

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