Base frames, i.e. template frames for openings in walls or the like, provided with means for securing a further rigidly-mounted frame; Special adaptations of frames to be fixed therein

Full Title

Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings (E06B5/00 takes precedence; features relating also to inner frames or wing frames, features relating solely to the mounting of inner frames E06B3/00; corner joints or edge joints E06B3/96) > Base frames, i.e. template frames for openings in walls or the like, provided with means for securing a further rigidly-mounted frame; Special adaptations of frames to be fixed therein