| 摘要 |
The knocking-down septum comprises at least a steel shutter structure (3), on the slats of which a granulated material (S) rests, which material - by lying on the slats of the shutter structure (3) according to its natural angle of repose (S2) - is retained by the same shutter; the thickness of the granulated material (S) is crossed by the bullets, which thus slow down their velocity, and consists of granules of natural or synthetic rubber, also of recovery and possibly of a self-extinguishing type, of dry sand, or of a mixture of sand and rubber or the like. |
