This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Jakob Degens Flugmaschine Ausschnitt . Von Jakob Degen entworfener Ornithopter Schwingenflgler bzw Schlagflgelflugzeug Jakob Degens Flugmaschine tif loc gov Jakob Degen Jos Belbing Kupferstich PDold Ornithopters Jakob Degen inventor
Page 2023 Free-images.com. All images are Public Domain