A visitor of a travelling exhibition of the Stiftung Technorama der Schweiz, which takes place in Biel and deals with the work of the Italian inventor, painter and researcher Leonardo da Vinci, looks at a prototype of a propeller by Leonardo da Vinci, similar to a helicopter, picture taken on 20 August 1971. (KEYSTONE/PHOTOPRESS-ARCHIV/Hugo Loertscher)
Ein Besucher einer Wanderausstellung der Stiftung Technorama der Schweiz, die in Biel stattfindet und das Wirken des italienischen Erfinders, Malers und Forschers Leonardo da Vinci zum Thema hat, betrachtet einen Prototypen einer Luftschraube von Leonardo da Vinci, der einem Helikopter aehnlich ist, aufgenommen am 20. August 1971. (KEYSTONE/PHOTOPRESS-ARCHIV/Hugo Loertscher)
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