Original Patentschrift - F. Pelzer in Dortmund , 1882 , Centrifugal - Ventilator !!!

Original Patentschrift - F. Pelzer In Dortmund , 1882 , Centrifugal - Ventilator !!! - Tools
Original Patentschrift - F. Pelzer In Dortmund , 1882 , Centrifugal - Ventilator !!! - Tools
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