composed of several parts with respect to the cross-section of the frame itself

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) > Frames for doors, windows, or the like to be fixed in openings ( special adaptations for fixing in base frames E06B1/02; features relating solely to the mounting of glass panes or other sheets E06B3/00) > Frames of plastics > composed of several parts with respect to the cross-section of the frame itself