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调²研室实测40口罩

Update 2016-12-21
Totobobo filter 60 seconds test on youku
Totobobo filter test (two different air flow rate) on youku

%e6%9c%89%e8%b0%83
%e6%9c%89%e8%b0%83-4-poor-filters
%e6%9c%89%e8%b0%83-5-reusable-masks
%e6%9c%89%e8%b0%83-8-good-masks

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