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Elektrisiermaschine. HubertFranois Gravelot Die Elektrisierte um Public Domain Transferred from de de Bild Elektrisiermaschine Rainer Zenz de PDold original upload log page de Elektrisiermaschine Sep Rainer Zenz HubertFranois Gravelot Die Elektrisierte um Public Domain Otto von Guericke Electrostatic generators