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Description: Transmitting electrical signals patent by the inventor of radio Guglielmo Marconi, 1897. PRINTABLE DIGITAL IMAGE Printable digital file can be used for creating art print, poster and other wall art …

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Description: Antique page from original manuscript of the Philosophiae Naturalis Principia Mathematica, Newton’s masterpiece on the laws of motion and the law of gravitation. The Principia was printed in London …

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