Just stumbled across this article:
Karpen's Pile: A Battery That Produces Energy Continuously Since 1950 Exists in Romanian Museum.
According to the article, the invention has been patented...
Karpen's Pile: A Battery That Produces Energy Continuously Since 1950 Exists in Romanian Museum.
The "Dimitrie Leonida" National Technical Museum from Romania hosts a weird kind of battery. Built by Vasile Karpen, the pile has been working uninterrupted for 60 years. "
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