original Patent - Gottfried Liessem & Peter Laufenberg in Köln , 1903 , Schulbank , Schule !!!

Original Patent - Gottfried Liessem & Peter Laufenberg In Köln , 1903 , Schulbank , Schule !!! - Historical Documents
Original Patent - Gottfried Liessem & Peter Laufenberg In Köln , 1903 , Schulbank , Schule !!! - Historical Documents
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