I can not uplad the file, so here is a dropbox link:
https://www.dropbox.com/s/cehrg451lpcnhjv/Ahlborn.pdf?dl=0
Ahlborn C33
I had these papers from Ahlborn Ditzingen.
The organ was made around 1960. It plays very well and has been used the last decades for organ studies.
I think it will become available because it takes a lot of needed place.Ahlborn.pdf