After the war, the Germans discovered that all their leading two-wheeled stroller designers had fled the country. Rebuilding the two-wheeled stroller industry would be hard, but they were determined to make a go of it, even if it meant starting from scratch.
Or something. Otherwise, I can't figure out what in the Sam Hill those folks were thinking when they strapped this kind onto an organgrinder monkey's bike and took a picture.
More description, if not more explanation: Two-Wheel Stroller (Popular Mechanics, Aug, 1950) [modernmechanix.com via dt reader jason]