by labyrinth packings

Full Title

Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings > Tightening or covering joints between the border of openings and the frame > by labyrinth packings

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