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| View Original: | Ruhmkorff_text.png (904x564) | |||
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| Keywords: Ruhmkorff text.png Ruhmkorff's induction spark coil text 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 Induction coils | ||||
