| 摘要 |
The add-on unit (1) is intended for fitting on the inside of a window (3) or door and consists of a frame (2) on which Japanese paper (4) is secured, preferably with adhesive, on the side facing the window or door. This frame is fixed releasably to the window or door frame. - Bushes (6) have external and internal screw threads which are screwed in bores (5) in the window frame. Screw bolts (9) through corresponding bores (8) in the frame (2) are capable of engaging the bushes. The frames may consist of wood and/or metal. FL(1/1)
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