Foto de stock - 26 January 2021, North Rhine-Westphalia, Essen: A mask is fitted in the mask test stand. The certification and testing process of FFP2 masks and KN95 masks is carried out by DMT and TüV-Nord in a laboratory in Essen. Photo: Fabian Strauch/dpa. - Essen/North Rhine-Westphalia/Germany

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