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Zwoelfpoliger Gleichstromdynamo von Siemens Halske. Zwlfpoliger Gleichstromdynamo von Siemens Halske Twelvepolar dc dynamo by Siemens Halske Bibliothek allgemeinen und praktischen Wissens fr Militranwrter Band III Deutsches Verlaghaus Bong Co Berlin Leipzig Wien Stuttgart Scan made by Kogo Public Domain because copyright expired