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.
Keywords from Image Description:
Nomogramm piraniVakuummeter. Gasartabhngigkeit des piraniVakuummeter own original text selbst erstellt Albyn de br Albyn Albyn original upload log page de Gas Albyn bytes no Andere Versionen original upload log date username resolution size edit summary March User Martin KB no to version as of March March