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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:59, 18 February 2010 | 814 × 1,243 (271 KB) | Harryzilber | {{Information |Description={{en|1=Illustration of the photophone's receiver, originally from: El mundo físico : gravedad, gravitación, luz, calor, electricidad, magnetismo, etc. / A. Guillemin by: Guillemin, Amédée, published by: Barcelona Montaner y |
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