Then there's the whole world of magnetic gears.
An introduction to the subject...
https://hackaday.com/2016/08/15/ask-...ears-good-for/
Because magnetic gears are not in physical contact friction is negligible so they are favored by clockmakers. Here are some examples...
Bob Mackay - Magnetic Clock
and, for more detail, a build thread of the clock that was featured in Digital Machinist magazine...
http://www.modelenginemaker.com/index.php?topic=3262.0

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