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並前往https://www.ilo.org/dyn/natlex/docs/ELECTRONIC/70145/69502/F1140545243/JPN70145.pdf

Standard for Dust Mask - ILO

3 Dust mask shall be categorized, according to the performance, i.e. each replaceable type dust mask into RS1, RS2, RS3, RL1, RL2 and RL3, ...

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