| 摘要 |
1,135,346. Vehicle theft alarms. C. R. HUNT. 20 Nov., 1967 [2 Nov., 1967], No. 49875/67. Heading G4N. In a vehicle alarm system, a master switch has two pairs of make contacts connected to door switches so that when the master switch is in one position, opening a door causes energization of a relay which causes the horn to be sounded until the master switch is restored to its other position. The master switch (preferably key-operated) includes contacts in the ignition circuit. |
