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Tom Del Rosso[_6_]

wrote:
I have seen devices that require a thin tool inserted into the holes
(please, not when plugged in), to release internal tabs. Maybe that?

When I was a kid we had a vaporizer (humidifier that used electrodes in
water inside a sealed container) that looked like it was designed in the
50's or early 60's. It had an excellent safety that required you to
insert its own plug to unlock it to open for cleaning, and it locked the
plug in place until you closed it.