| 摘要 |
PCT No. PCT/GB89/01028 Sec. 371 Date May 1, 1991 Sec. 102(e) Date May 1, 1991 PCT Filed Sep. 4, 1989 PCT Pub. No. WO90/02862 PCT Pub. Date Mar. 22, 1990.Louvre structures wherein holding members for the louvres are carried on bars which extend across a frame and are pivotally mounted with respect to the frame so as to be axially rotatable relative to the frame and which cannot be removed from the frame, at least when the window is installed. |
