| 摘要 |
A method and apparatus 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 dialing device, preferably of the type disclosed in U.S. Pat. No. 3,947,641, the telephone number dialing device being connected to one or a number of manually or automatically operable alarm indicators, which when operated initiate dialing of predetermined telephone numbers.
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