As we all know, the Bücker aircraft company started producing Jungmann at the Berlin-Johannistal airport in 1936. Long before that, however, the airport was the home to many famous aviation enterprises.
First opened in 1909 (to avoid crowding the airships flying from Tempelhof) many of aviation's pioneers visited the airport. The first ever cross-country flight in Germany landed at Johannistal (Hubert Latham took 15 minutes to fly the five miles (eight KM) from Tempelhof in an Antoinette!) and the first round-Germany flight took off from there.
Before Bücker, manufacturers who set up shop at Johannistal included: Fokker, Albatros Werke, Luft-Verkehrs-Gesellschaft AG (LVG), E. Rumpler, and "Flugmaschine-Wright-Gesellschaft" (Wright aircraft Society).
You can read a lot more about this historic airfield here: http://www.forgottenairfields.com/germany/berlin/berlin-johannistal-s435.html
Today the airfield is a city park (Europark) but at least it hasn't been built over yet. Some of the hangars and buildings are still there too.