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I doubt they are in cell phones, but some electronics use oil filled capacitors. I can envision a vacuum causing problems with those.
And tw, the deal with hairdryers is that you have immediate feedback from your nerve endings. They are not as hot as heat guns, but they can burn you if you hold them too close to your skin for too long. That's why it's not surprising that the one burn report above is when a hairdresser burned a customer. There's no instant feedback there.
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