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Excerpt from Traité Élémentaire de Géométrie Descriptive, Vol. 2: A l'Usage des Classes de Mathématiques Spéciales Et des Candidats A l'École Normale Supérieure Et A l'École Polytechnique; Texte
La condition pour la génératrice de s'appuyer sur une ligne fixe est quelquefois remplacée par celle de s'ap puyer sur une surface ou de satisfaire à toute autre con dition.
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