hi there dear community many thanks for running the awesome subreddit
I am interested in creating of bike frames. And currently we are looking for some suppliers for the tubes and some more stuff.
here i found a map – that might be helpful
https://utahrandonneur.files.wordpress.com/2022/03/s_l1600_f180ed7a2bbddbf16464e6c081bc55b5b4e80a06.jpg
note: https://utahrandonneur.wordpress.com/2022/02/28/map-of-italian-cycling-brands/
The map was created by Andrea Bonfanti from Italy. He a noted De Rosa historian who also wrote the book on De Rosa bicycle history. I have both the map and book, he does an amazing job of research and is very knowledgeable and approachable.
by Munich_tal