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On a sort of related subject, back before aluminizing, they had to have made many bent beam type CRTs and even some after that were aluminized, so there had to have been many thousands if not even millions of them, and ion traps for each of them, don't the ion traps outlast the tubes they were with? So you would think there would be lots of them out there, but they seem to be rare, as do focus magnets, weird.
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