original Patent - Franz Tratz in Schweinfurt , 1890 , Ofenrohr - Wandbüchse , Ofen , Öfen , Kamin , Heizung , Feuerung !

Original Patent - Franz Tratz In Schweinfurt , 1890 , Ofenrohr - Wandbüchse , Ofen , Öfen , Kamin , Heizung , Feuerung ! - Historical Documents
Original Patent - Franz Tratz In Schweinfurt , 1890 , Ofenrohr - Wandbüchse , Ofen , Öfen , Kamin , Heizung , Feuerung ! - Historical Documents
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