As always: I enjoy this series and you make me get into a time machine, @. What things are, like you agreed with @velimir: he also brought us in his series of motorcycle photos an old air pump. Quite a relic.
Our ancestors were geniuses! Of the three devices today, I could only see the sound system. I'd heard the other two mentioned, but I hadn't seen them. I remember when I was a little girl at home there was a sound system and lots of acetate records. The experience of taking the needle to the groove or music I wanted to listen to and changing it from side A to side B was an experience I remember clearly. They had to treat them delicately because they scratched each other. The same thing happened with the cassettes that sometimes got stuck in the device and we had to carefully remove the tape so as not to break it. People were left in the middle of the dance floor without being able to dance! Hahahaha. I enjoyed your post. Thanks for sharing.