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.
Switchlamp. en Adrignola CommonsHelper Ken joram koen en English Ken joram koen original upload log page en Switchlamp Ken joram koen bytes no Unidentified diagrams Petri nets
Page 2023 Free-images.com. All images are Public Domain