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Trebuchet. Threequarter view of trebuchet diagram of trebuchet from the Dictionnaire raisonn de l'architecture franaise du XIe au XVe sicle From French Trbuchet engin militaire du Moyenge Source Dessin d'Eugne ViolletleDuc grav par Guillaumot pour le Dictionnaire raisonn de l'architecture franaise du XIe au XVe sicle PDold Trebuchets