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A comment on What Happens When You Drop A Magnet Inside A Copper Tube [video]. Parent comment

Re:What Happens When You Drop A Magnet Inside A Copper Tube ... by throw_away on Tuesday February 04, 2014 @12:23AM (#7175674)
To be pedantic, they're usually held up by a counterweight or by hydraulics. They generally move by magnets, though.
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