E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
EXTENDED SPACING PIECE USED IN THE MANUFACTURE OF A SPACING FRAME TO SEPARATE LEAVES FROM AN INSULATING UNIT, SPACING FRAME COMPRISING SUCH A SPACING PIECE, INCLUDING SINGLE FRAME, AND A UTILITY METAL FOR DIVIDING