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YY 0469-2004
Chinese Standard: 'YY 0469-2004'
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YY 0469-2004
English
559
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Days<=4
Technical requirements for surgical mask
YY 0469-2004
Obsolete
YY 0469-2004
SIMILAR
Google-Books for your assessment (Full-PDF of
YY 0469-2004_English
needs to be translated from scratch):
YY 0469-2011
GB/T 15812-1995
GB 19082-2009
YY/T 1633-2019
YY/T 1642-2019