Some relatively recent technologies seem harder to keep alive on a small scale (crt screens, hard drives are obvious examples). Even older, simpler ones are bor

Some relatively recent technologies seem harder to keep alive on a small scale (crt screens, hard drives are obvious examples). Even older, simpler ones are borderline, someone (https://www.daliborfarny.com/ https://www.daliborfarny.com/) had to work very hard to manufacture nixie tubes again.