| 摘要 |
<p>The subject of the invention is a smoke-producing alarm device combined with a pre-alarm for the protection of vehicles and the like. It consists in the connection, to the sound or visual alarm circuit (2, 3), of a delay element (6) igniting the smoke-producing canister at a deferred time. It is intended to permit a dual protection at adjustable time intervals, consisting in a sound or visual signal followed by an emission of aggressive gas. <IMAGE></p> |
