Hollow frames

Full Title

Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings > Frames for doors, windows, or the like to be fixed in openings > Metal frames > of special cross-section > Hollow frames

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS, IN GENERAL; LADDERS

Subclass:

FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES, OR LIKE ENCLOSURES, IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES