I remembered I had this document when discussing the Quandt Group on another forum. Years ago I bought a list of deliverers to the Quandt Group companies in 1969. 345 pages of it.
The Quandt group included the remnants of DWM, IWKA and Mauser.
A funny note: the document came from a former DDR archive :)
While browsing through it I found some interesting examples, worth mentioning here.
Dynamit-Nobel in Fürth supplied brass blanks to IWK Karlsruhe, while the Troisdorf plant supplied IWK with powder and primers.
Dynamit Nobel-Genschow in Köln-Niehl supplied Mauser with ammunition and Comet with Signal Pistols.
Winchester in Düsseldorf supplied Mauser with .22lr ammunition (sold by Mauser as ‘KK80’).