I don't think circuits degrade that much over 100 years, now the electronic components (like capacitors) may need to be replaced, some plastic parts may also, b

I don't think circuits degrade that much over 100 years, now the electronic components (like capacitors) may need to be replaced, some plastic parts may also, but the devices could still be made operational. I guess besides component failure is the amount of firmware data loss over time (devices with EPROMs instead of ROMs) would be another factor, which might not be good for the more complex devices, then again such code might be backed up somewhere in a vintage device collector's archive.