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E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
E04D3/40—Slabs or sheets locally modified for auxiliary purposes, e.g. for resting on walls, for serving as guttering; Elements for particular purposes, e.g. ridge elements, specially designed for use in conjunction with slabs or sheets
Systeme d'assemblage par accrochage comportant des elements d'accrochage formes par des nervures pourvues de levres elastiquement deformables, en particulier curvilignes
Procede de fabrication de chevilles destinees a l'ancrage dans le sol, en particulier de poteaux ou piquets, et chevilles obtenues au moyen dudit procede