| 摘要 |
An air- or gas-filled tube 8, which provides an elastic support to the frame 4 with respect to shock waves caused by explosions, is placed between the frame 4, which contains a window pane 5 and a shoulder 3 provided in the opening 2, parallel to the window pane 5, which itself serves for holding elastically, by means of air-inflated tubes 16, a planar element, which may or may not be removed, such as a roller shutter 14. <IMAGE>
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