Stock Photo - 21 January 2021, North Rhine-Westphalia, Duesseldorf: A technician installs a filter in an air filtration system in the entrance area of the state parliament of North Rhine-Westphalia. In the Düsseldorf state parliament, 41 air filter systems are installed for corona protection. Twenty-one have been ordered by the Landtag administration to be placed at the visitors' entrance, in elevators and in the lobby, among other places. Photo: David Young/dpa. - Duesseldorf/North Rhine-Westphalia/Germany

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