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:
Karrickprocess. The image is from USPTO document government publication from From Patent PDUSGov original upload log page en Karrickprocess Nagle bytes no from patent Uncopyrightable under US law Timharwoodx bytes no image is from USPTO document government publication from Chemical reactions Coal Petroleum production