Keywords: Roebelstab-Patent.jpg Auszug aus Roebel-Patentschrift vom 19 März 1912 Spannungs-Wechsel ABB 2000 1912 Ludwig Roebel First uploader was Flodur44 at http //de wikipedia org de wikipedia This image is in the public domain due to its age Ludwig Roebel died 1934<br/> original text 1 historisches Dokument PD-old Original upload log de wikipedia Wdwd CommonsHelper page de wikipedia Roebelstab-Patent jpg 2008-01-23 11 05 Flodur44 1666×2388× 1810920 bytes <nowiki> Andere Versionen </nowiki> Roebel bars |