William Harley and Arthur Davidson on early motorcycles.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...s_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...otorcycles.jpg
Previously:
https://www.homemadetools.net/forum/...149#post138296
https://www.homemadetools.net/forum/...873#post137314