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Old Variac -- chassis ground? is it safe?

Have done a bunch of googling about chassis ground and hot chassis radios and such and I suspect this is just an old design, but I'm confused about why it appears in a Variac. … The transformer mounting core and wiper mechanism is not isolated from the chassis (they are in contact at the front panel), so there's (multimeter-verified) continuity between the outer chassis and all …
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