Good source! Here's a photo that just might help: (pic)
And my computer program's translation:The AUTO-UNION racing car made of injection-molded magnesium is a specialty of MAHLE KG Stuttgart-Bad Cannstatt (formerly Elektrometall GmbH). For the first time, this procedure was practiced only by us in 1925, as it is unique in the world. MAHLE KOMM.GES Stuttgart-Bad Cannstatt Note: The company was originally called Elektronmetall and not, as in the text, Elektrometall. Probably a misprint.