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See Chinese contents: QB/T 4055.1-2010 QB/T 4055.1-2010: Cermet casing of watches - Part 1: Oxide cermet casings
QBT 4055.1-2010 specifies the terms and definitions, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of oxide cermet casings of watches. This Part applies to the casings which use zirconia (ZrO2) as the main composition of Oxide cermet. Casings which use other ingredients may also reference to this Standard.
