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:
Sampleswitchboxgraphic. diagram of switchbox Transferred from org en transferred to Commons by User Liftarn using de php CommonsHelper Michael DoroshTalkMichael DoroshTalk Original uploader was Michael Dorosh at org en Released into the public domain by the author en Michael Dorosh Original upload log page en Sampleswitchboxgraphic