Vortex Geschichte (Aufzeichnung Leonardo da Vinci und Karman
The original uploader was <a href="https://en.wikipedia.org/wiki/de:User:Alfaomega" class="extiw" title="w:de:User:Alfaomega">Alfaomega</a> at <a href="https://en.wikipedia.org/wiki/de:" class="extiw" title="w:de:">German Wikipedia</a>.
5 October 2008 (original upload date)
<span class="int-own-work" lang="">Own work by the original uploader</span>