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| Keywords: Pacinotti-Grammescher Ring.png Pacinotti-Grammescher Ring Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III 1905 / Deutsches Verlaghaus Bong Co Berlin Leipzig Wien Stuttgart Scan made by Kogo Public Domain because copyright expired PD-old Dynamos History of electricity Early electric motors Zénobe Gramme Antonio Pacinotti | ||||
