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10 Small Electric Motors, c. 1915...
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4 Demonstration Model Electric Motors, c. 191...
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3 Demonstration Electric Motors...
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Large Induction Coil by Max Kohl, c. 1915...
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Siemens & Halske Direct-Current Motor, c. 192...
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Induction Coil based on Ruhmkorff Design, c. ...
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Sliding Induction Coil based on Design by Du ...
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