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Electro-Magnetic Motor with Rotating Geissler...
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Large Electromagnetic Motor with Geissler Tub...
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"Menlo Park Reminiscences", 1937...
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Early Electric Motor with Sliding Resistor, c...
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2 x Radiaver Saint-Gobain, 1937 onwards...
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Large Geissler Tube with Uranium Glass Flower...
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4 Interesting Motors...
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Large Induction Coil by Siemens & Halske, c. ...
