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:
Roue nombre de dents variables. Scan aus Wassn Henry The Odhner History An Illustrated Chronicle of Machine to Count on Gothenburg Wezta Sprossenrad UTC Sprossenrad Original uploader was Wernerroth at org de derivative work Ezrdr talk Removed the german labels Ezrdr Sprossenrad PDold original upload log This image is