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File:Hittorf portrait from Festschrift 1904.jpg
De Wikipédia, l'encyclopédie libre
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Fichier:Hittorf portrait from Festschrift 1904.jpg
https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue English Photograph of Johann Wilhelm
Hittorf
. Late 1800s or early 1900s.