File:Thompson, Silvanus P. – Polyphase electric currents and alternate-current motors, 1901 – BEIC 6575273.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:42, 21 March 2022 | 1,309 × 2,067 (116 KB) | Marcella Medici (BEIC) | pattypan 22.02 |
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