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E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
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FR71128D1957-03-221957-03-22Perfectionnements apportés aux panneaux composés notamment pour le bâtiment, et à leurs procédés de fabrication
ExpiredFR71128E
(fr)