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.
EnneodeSymbol.svg Schaltsymbol einer Enneode einer Elektronenrhre mit siebern Gittern Circuit symbol of nonode thermionic valve with seven Grids Nonode Ennoda own own Vacuum tube symbols SVG vacuum tubes
Page 2023 Free-images.com. All images are Public Domain