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Priority to NL7206769ApriorityCriticalpatent/NL7206769A/xx
Publication of NL7206769ApublicationCriticalpatent/NL7206769A/xx
E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
E04D3/24—Roof covering by making use of flat or curved slabs or stiff sheets with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like