Chain machine of the company Jakob Bengel. Exposed in the industrial monument Bengel, Idar-Oberstein
<a href="//commons.wikimedia.org/wiki/User:Ra%27ike" title="User:Ra'ike">Ra'ike</a> (Wikipedia)
CC BY-SA 3.0 de
<span class="int-own-work" lang="en">Own work</span>