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:
Ignitron.svg de Schematische Zeichnung eines Ignitrons Ignitron UTC Ignitron it User Drdlk derivative work Markus Matern File Ignitron PDuserit PDuserw original upload log This image is derivative work of the following images File Ignitron with PDuserit PDuserw Drdlk Bytes no Uploaded with derivativeFX Ignitron