I hope there's an exhibit on the first generation ten-speed dura ace group set, which was a legitimate jump ahead in capability and precision when it was introduced in 2004. Everything since then has been refining some of the same.
I think Shimano become famed with "self-centering" derailleur some 50 years ago?
Before that you had to watch gears all the time.
I remember tinkering with my Ukrainian gears to make them more loose in "Shimano style".
https://uk-wikipedia-org.translate.goog/wiki/%D0%A5%D0%B0%D1...
Apparently Dura Ace was introduced in 1973!
https://www.shimano.com/en/100th/history/products/14.html