Well, wow. That is a cool and interesting bunch of old stuff. I'm afraid I can't tell you much.
Are you familiar with this site:
https://thecabe.com/forum/
It's a forum like this one, but the guys there tend to be more interested in older American bikes; I think you'll get more help there.
I'm still thinking your second "handlebar" is not a handlebar. It's too flimsy. With the foam coating, I think it must be from the 60's or even 70's, while most of your parts seem to be from the 30's and 40's. But don't quote me; I'm out of my league here.