Maurer-Union built petrol-electric cars and trucks around 1910. Is it one of those?
I'm not totally sure whether the company was still called Maurer-Union or Union AG back then, because they were taken over by Nürnberger Feuerlöschgeräte- und Maschinenfabrik, vorm. Justus Christian Braun AG, in 1910. But it seems they kept their name at least until 1911.