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Ramsden's Electrical Machine, c. 1850...
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Large Electro-Magnetic Motor with Rotating Ge...
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Bright High-Wattage Light Bulbs, c. 1925...
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5 Interesting Light Bulbs, c. 1920...
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Electrical Machine and Battery, c. 1900...
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Large Electro-Magnetic Motor, 1910...
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Alternating Current Motor by J. Kalb & Co., c...
