NF S85-200-1996 钟表业.钟表钻石.术语和符号
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NF S85-200-1996
钟表业。钟表钻石。术语和符号
Horology. Jewels for watches and clocks. Terminology and symbols.
钟表业。钟表钻石。术语和符号
Horology. Jewels for watches and clocks. Terminology and symbols.
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