I want to know the answer to the following question:
Who also collaborated in the design of the 75 mm gun?
All the background I'm provided with is that "Germany's high-altitude needs were originally going to be filled by a 75 mm gun from Krupp, designed in collaboration with their Swedish counterpart Bofors, but the specifications were later amended to require much higher performance.". Is that enough to answer the question?
Answer: yes