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Material Knowledge Of Watch Crystal
by Watches5.com Admin January 22, 2020
(1) Sapphire is a kind of natural diamond, which has high anti-wear and anti-corrosion effects after being synthesized with alumina. Hardness is 22...

Posted in Build Your Own Watch, Design Your Own Watch, Make Your Own Watch, Watch Manufacturing In China, Wooden Watch Manufacturers, Wristwatch Factory

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