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.
Schraubung. Schraubung own br Original text Selbst erstellt mit IPE kaist ac kr Emesk at org de Released into the public domain by the author PDrelease Original upload log page de Schraubung Emesk bytes no Andere Versionen Helicoids Crystallography
Page 2023 Free-images.com. All images are Public Domain