发明名称 |
KOMMUNIKATIONSANLEGGNING AV NODSENDARTYP |
摘要 |
A pocket-size portable transmitter in an emergency call transmission system for geriatric persons has an actuator including a simple switch part such as a push button and a simple cover part movable between a normal closed position covering the switch to prevent accidental actuation and an open position exposing the switch for actuation. In a preferred system a plurality of transmitters are inductively coupled with respective receivers distributed to determine separate areas for use of the transmitters, the transmitters producing multi-element code sequence signals to avoid false alarms from outside interference, and the receivers having wired connections to a central alarm indicator assembly. |
申请公布号 |
SE409518(B) |
申请公布日期 |
1979.08.20 |
申请号 |
SE19750003847 |
申请日期 |
1975.04.03 |
申请人 |
* NATIONAL RESEARCH DEVELOPMENT CORPORATION |
发明人 |
K * GROSSFIELD;G B * ROPER |
分类号 |
G08B21/02;G08B21/04;G08B25/01;(IPC1-7):08B25/00;04B5/00 |
主分类号 |
G08B21/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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