Certain kinds of vintage electronics fall under this as well. Test equipment that contains nixie tubes for example. Not only are idiots buying up increasingly rarer devices to simply strip the display tubes out for friggin clocks, the chassis parts usually get tossed or broken up by people who don't understand that part A and part B need to be there in order for Part C to be of any value.
Granted, the old stuff can be surpassed by newer equipment, but older stuff can sometimes survive shocks that would make a newer instrument cry mommy and quit.
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