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Titel © iStock/www.industrieblick.net; Abb. 1 © goodluz/stock.adobe.com;
Abb. 3 © iStock/alvarez; Abb. 4 © Ermolaev Alexandr/stock.adobe.com;
Abb. 5 © auremar/stock.adobe.com; Abb. 6 © goodluz/stock.adobe.com;
Abb. 7 © DGUV/Dominik Buschardt