![](http://www.alamy.com/thumbs/6/2AEA0CC3-93FA-4A23-BF19-06BC3ECE3006/RMKRR6.jpg)
Dynamo machine from Hefner-Alteneck-Siemens, 1873, 1898
Size: 2983px × 2441px
Photo credit: © Quagga Media / Alamy / Afripics
License: Licensed
Model Released: No
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