![](http://www.alamy.com/thumbs/6/F27B664E-E295-447E-B838-56D0088EE550/2J09M2X.jpg)
Cylinder cooling in the Hirschmann bicycle with a petrol engine. Old 19th century engraved illustration from La Nature 1899
Size: 5315px × 5298px
Photo credit: © Old Books Images / Alamy / Afripics
License: Licensed
Model Released: No
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