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HagenGotthilf.Pillau. de Denkmal ber Gotthilf Hagen aus Pillau den heutigen Baltijsk Wasserbaudirektor aus Knigsberg und Berlin Urhebers des HagenPoiseuilleschen Gesetzes Personal collection author This picture is to the user Dr NeumannMeding from the director Jakimov of the Museum of History and Art in Kaliningrad Russia Gotthilf