Joseph Swan: verschil tussen versies
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*{{en}} [http://chem.ch.huji.ac.il/history/swan.html Biografie Joseph Wilson Swan] The Hebrew University of Jerusalem
*{{en}} [http://americanhistory.si.edu/lighting/bios/swan.htm Lamp Inventors 1880-1940: Carbon Filament Incandescent] Smithsonian National Museum of American History
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