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Well, the history of analog computing sort of dead-ends around 1968, when digital computing became more common and available. It was actually in the 1980s when mathematicians were forced to rediscover this hardware, because they found that in studying and calculating chaotic processes, a digital computer with discrete logical steps wasn't able to sufficiently parse some of these new mathematical topologies. But by that point, a lot of the machines had been consigned to the scrap heap (which is where I found the Systron-Donners) as 'obsolete', and the tooling necessary to produce these on a factory scale again just wasn't available; in fact, many of the firms making them were long-gone. It's sort of like what was happening to modular synths in the early 1980s, when everyone jumped to digital in the rush to something 'better'...although synthesists rediscovered modular synthesizers in time to keep the whole thing from totally dying out, whereas analog computers had long been considered worthless, obsolete dinosaurs in computer science by the time they were pressed back into service again. That's the difference between 'art' and 'science'; sometimes the cutting edge ISN'T what you want/need!