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:
Mine de charbon.svg icone pour symboliser une mine de charbon MartinNathusius Verffentlichung UTC MartinNathusius Verffentlichung Martin von Nathusius derivative work Frdric talk extracted and made into svg kilom MartinNathusius Verffentlichung PDold PDold original upload log This image is derivative work of the following images