| 摘要 |
In an anti-hijacking vehicular alarm system in which an alarm is to be actuated upon unauthorized opening of a door of a vehicle, alarm circuit means for actuating the alarm in response to the opening of a vehicle door, operator means for selectively activating or deactivating the alarm circuit means, timer means capable of being actuated to operate for a selected interval of time, means for precluding operation of the operator means during the selected interval of time without actuation of the alarm, and means for precluding alteration of the duration of the selected interval of time during that interval without actuation of the alarm. |
