1. 3M masks refer to all products produced by 3M company that can be called masks, such as warm masks, dust-proof masks, medical protective masks and medical surgical masks. 3M Company is the inventor of particulate matter protective mask.

2 and 3M are both company names and registered trademarks. The full name of 3M Company is Minnesota Mining Manufacturing Company. 3M is a global diversified scientific and technological enterprise. The anti-particle mask products sold by 3M in China come from different places of origin, and all of them have been certified by Lao An (LA) in China. "3M mask" refers to all products produced by 3M company that can be called masks, such as warm masks, anti-particle masks (dust masks), medical protective masks and medical surgical masks.