| 摘要 |
<p>A method for transmission of alarm signals by utilization of an entrance telephone set system connected to a public telephone network, of the type including a selectively addressable telephone number dialling device, preferably of the type disclosed in Swedish Patent No. 373 474, said telephone number dialling device being connected to one or a number of manually or automatically operable alarm indicators (1, 1', 1''), which when operated initiate dialling of predetermined telephone numbers.</p> |
