Featured Drafting tool set, Germany maker help

Hi all, I found this at a local yard sale for $5.00 i think because the snap on the case is missing. The larger pieces are marked Germany and PAT. Feb 19 1907. Hoping to find out the maker?
The case is stamped Germany on the right and on the left is
9526 FGQ.
Mikey

 

I believe Dietzgen, Staedtler, and Koh-i-Noor would be some of the possible manufacturers.

 

Nice set, I often see them at flea markets, though not as complete or in the best of condition. When I started in graphics it was before computers took over, so I know how to use these instruments

 

Thanks, I don't know much about these but the set is complete from what i can see and in very good condition, other than the case.

 

Keuffel & Esser Patent 844,772, but would expect the case and instruments to bear some kind of K&E trademark, suppose they could have sold use of the patent's pivoting mechanism to another manufacturer...

https://patents.google.com/patent/US844772

~Cheryl