The nearest approach to perpetual motion is an “ earth 1 driven electrical clock,” which has gone for 10 years without winding. Once fixed, it keeps going says its inventor, until the works wear out.
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Otago Daily Times, Issue 21033, 23 May 1930, Page 4
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34Page 4 Advertisements Column 2 Otago Daily Times, Issue 21033, 23 May 1930, Page 4
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