Just saw this interesting article about Akizuki Denshi, an 50+ years old electronics shop in Japan.
Original Medium link: https://fabscene.medium.com/publishing-schematics-before-open-source-was-a-word-55-years-of-akizuki-denshi-japans-be7ca9629704
In addition to parts, they sell electronics kits with full schematics, decades before “open source” became a term of art.
Interesting read!