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See Chinese contents: QB/T 4055.2-2011 QB/T 4055.2-2011: Cermet casings of watches - Part 2: Carbide cermet casings
QBT 4055.2-2011 specifies the technical requirements, testing methods, rules for inspection, packing, marking, transport and storage of carbide cermet watchcases and watch-bands of watches. This Standard applies to watch-cases and watch-bands made by carbide cermet material with tungsten (WC) and titanium (TiC) as main composition. Watch-cases and watch-bands made by carbide cermet material with other composition can also refer to this Standard.
