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In page Perpetual motion:
"Some examples of such devices include:
- The Atmos clock uses changes in the vapor pressure of ethyl chloride with temperature to wind the clock spring.
- A device powered by induced nuclear reactions or by radioactive decay from an isotope with a relatively long half-life; such a device could plausibly operate for hundreds or thousands of years.[citation needed]
- The Oxford Electric Bell and the Karpen Pile are driven by dry pile batteries.
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