Otto Heitzmann, Clavierfabrik# QUERYe30b200248e7752adfc892ab1231ff21
WGW RDF resource: http://www.geschichtewiki.wien.gv.at/Special:URIResolver/Otto_Heitzmann-2C_Clavierfabrik-23_QUERYe30b200248e7752adfc892ab1231ff21