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Priority to NL6503614ApriorityCriticalpatent/NL6503614A/xx
Priority to GB1253266Aprioritypatent/GB1146042A/en
Publication of NL6503614ApublicationCriticalpatent/NL6503614A/xx
E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F17/00—Vertical ducts; Channels, e.g. for drainage
E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof
E04F17/023—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof made of masonry, concrete or other stone-like material; Insulating measures and joints therefor