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Due to the national holidays as Golden Week, we will close 2018/4/28~2018/4/30 and 2018/5/3~2018/5/6.
This may cause delays with our responses. Thank you for your understanding.
Noxious gases, hazardous dust and oxygen cannot be used at less than 18% of the working environment.(No gas masks or dust masks specified by the occupational safety and Health Act is) Please use the mask was always uses in these tasks.