Keywords: Ptska.png Chem Laboratorium Karlsruhe scan before 1900 author PD-old original upload log de wikipedia Leyo CommonsHelper page de wikipedia Ptska png 2008-09-27 12 54 Muellerb 1000×614× 337530 bytes <nowiki> Andere Versionen </nowiki> Karlsruhe Institute of Technology History of Karlsruhe |