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HagenGotthilf.Pillau. Denkmal ber Gotthilf Hagen Wasserbaudirektor Knigsberg und Berlin Urheber des HagenPoiseuilleschen Gesetzes Das Denkmal ist erhalten in Pillau dem heutigen russischen Baltijsk Personal collection author This picture is to the user Dr NeumannMeding from the director Jakimov of the Museum of History and Art