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Publication of BE689699ApublicationCriticalpatent/BE689699A/xx
E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
E04D5/10—Roof covering by making use of flexible material, e.g. supplied in roll form by making use of compounded or laminated materials, e.g. metal foils or plastic films coated with bitumen