Historische Schriften, alte Bücher und Ahnenforschung
1898 führte Stephan Kekule von Stradonitz ein Nummerierungssystem ein, die Kekule-Nummern (oder Kekule-Zahlen, Kekule wird gelegentlich auch Kekulé geschrieben), nach dem bis heute die Vorfahren (Ahnen) eines Probanden üblicherweise nummeriert werden.
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