File:1911 Britannica - Siemens Electrodynamometer.png
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![File:1911 Britannica - Siemens Electrodynamometer.png](https://upload.wikimedia.org/wikipedia/commons/thumb/4/46/1911_Britannica_-_Siemens_Electrodynamometer.png/800px-1911_Britannica_-_Siemens_Electrodynamometer.png?20120108173218)
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