Image: Battery-patent-US439151
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Description: Dry cell battery by Wilhelm Louis Frederik Hellesen. US patent 439151
Title: Battery-patent-US439151
Credit: https://www.google.com/patents/US439151
Author: US Patent Office, Wilhelm Louis Frederik Hellesen, dead 1892.
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
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