Cold War: these were installed on Chieftain tanks in the 1970s.
Easier to watch if you know french.
[Hi from Argentina!] In spite the audio is in English, one trick is to enable the subtitles to help to understand the accent. I use it also sometimes with English by native English speakers, when they talk too fast and I keep missing a few words now and then.
Really nice tear downs in that channel. :-)
Also quite interesting the more recent Russian Tornado-S Rocket guidance circuit board: https://youtu.be/r94qCraTBYM
I cannot clock the regional accent. Where is this guy from? Alsace?