CNA: Singapore now able to produce filters for surgical masks, will be distributed to residents if needed…

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https://www.channelnewsasia.com/news/singapore/singapore-mask-filters-chan-chun-sing-covid-19-st-engineering-14061254

https://www.channelnewsasia.com/news/singapore/singapore-mask-filters-chan-chun-sing-covid-19-st-engineering-14061254

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