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Publication of NL7309533ApublicationCriticalpatent/NL7309533A/xx
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
E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
E06B3/96—Corner joints or edge joints for windows, doors, or the like frames or wings
E06B3/988—Corner joints or edge joints for windows, doors, or the like frames or wings specially adapted for sheet metal frame members with an open U-shaped cross-section