I had the good fortune to tour the Starrett factory some years back. They were still running pre-NC screw machines to make parts. It really is true that old machines, well cared for, will last just about forever. Apparently it's something of an axiom in the machining industry that tools that are no longer economically viable for large scale production end up in job shops where the capability is needed but there isn't a need to pump out volume.
The Springfield Armory[1] is also a neat visit. For hopefully obvious reasons, their machining exhibits are focused on the production of weapons. The American Precision Museum is actually housed in a historic privately-owned gun factory. It turns out a lot of the progress in machining is driving by the need to make weapons.