Sorry guys, but why didn't you ask for further hints? It was a damn difficult quest.And I congratulate you, mexchiva, your amusing little story is not that far from the truth.http://all-aero.com/index.php/56-planes-v-w/18429-wullschleger-peier-triplaneRoll down until July 1913:https://www.alt-zueri.ch/turicum/verkehr/zivilaviatik/zivilaviatik_zuerichhorn.html