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Old 01-06-2021, 01:54 PM   #3 (permalink)
freebeard
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Quote:
The first patents of free-piston linear generators date from around 1940, however in the last decades, especially after the development of rare-earth magnets and power electronics, many different research groups have been working in this field.

en.wikipedia.org/wiki/Free-piston_linear_generator
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