In 2011, NPR held a challenge to find any technology, device or product from history of mankind, that is not produced today. http://www.kk.org/thetechnium/archives/2011/04/technologies_do.php Three case studies of devices that should have gone extinct, showed that all these three remain in production, though slightly different in appearance and use. The other day, the discussion went on to a forum run by VoF, the Swedish Skeptics' Organization, and while some products thought to be extinct (halberds, slide rules, VCRs etc) were found to be manufactured today, the community came up with several solid examples of extinct technology. Several of them have military applications, and some would be familiar to civers. * Cylinder phonograph * Flatrod system - https://en.wikipedia.org/wiki/Flatrod_system * Guillotine * Mechanical decryption machine * Mechanical telephone switchboard * Personal nuclear missile (https://en.wikipedia.org/wiki/Davy_Crockett_(nuclear_device)) * Protective armor for elephants * Trireme (multi-decked galley) Can you make the list shorter, or longer?