The article I found is titled: Depeschenwagen mit Vierräder-Antrieb. Von Zivil-Ingenieur R. Schwenke, Berlin.
Schwenke
I initially understood that the vehicle had been designed/built by Robert Schwenke, but now I'm not so sure. After reading through the Google-translated article several times now, it seems Schwenke may have only been the author of the article. He goes into a great deal of detail, but speaks as though he had only examined and tested a vehicle built by someone else. And further review of the entire source periodical reveals that he authored several other articles in this same issue (all titled XXXXXXXXXXXXXXX. Von Zivil-Ingenieur R. Schwenke, Berlin.), in which he analyzes a variety of vehicles and component systems from an engineering perspective. However, he does mention the "Schwenke system" when discussing the 4-wheel-drive system, so I assume that was a system of his own design.
Austro-Daimler
The manner in which he mentions Austro-Daimler's more well-known armored car is confusing (when translated anyway) and almost seems to imply that this car was also built by Austro-Daimler. Then, when discussing the gearbox, he states that it's equipped with Daimler's double-thrust gears, but gives no other source for the gearbox itself.
De Dion Bouton
He mentions De Dion-Bouton when discussing the axles, shafts, and ball joints. However, it's not clear if those used on this car were made by De Dion, or if they were simply of similar design to those made by De Dion. The engine is described as a 2-cylinder, 12 horsepower, Passe-Partout-style unit, which sounds to me like the 1728cc De Dion Type S.
Based on all of this, I think the answer you're looking for is that it's a 4-wheel-drive Depeschenwagen (built by Robert Schwenke?) using a De Dion engine and chassis. I'm not certain this is correct, however. It might require a native German speaker to know for sure.
Here are the other photos provided:
