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(Of course - its a Timex - "Takes a licking and keeps on ticking.") my current analog quartz watch and prior LCD quartz watch, both water resistant to 100 meters.

Today, the vast majority of watches and clocks are battery powered and timed by the vibrations of quartz crystals.

Underlying the design of a simple clock like this is also a huge amount of mathematics.

The link is to the second page which discusses the Wilson T2000 and the Prince Classic.

Go to page 1 of the article for a discussion of wood racquets and page 3 for graphite racquets.

According to the site Clock A History, it was not until the 17th century that a practical clock with an accurate minute hand was developed.

The basic design of My First Clock would have been cutting edge back then.

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