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Keywords from Image Description:
Charpente.ferme.primitive. La ferme primitive est souvent dpourvue de poinons elle se compose d'un entrait AB de deux arbaltriers AC BC et d'un entrait retrouss DE destin empcher les arbaltriers de flchir et de se courber sous la charge de la couverture Carpentry ViolletleDuc Norman truss ViolletleDuc