DE274903C - - Google Patents
Info
- Publication number
- DE274903C DE274903C DENDAT274903D DE274903DA DE274903C DE 274903 C DE274903 C DE 274903C DE NDAT274903 D DENDAT274903 D DE NDAT274903D DE 274903D A DE274903D A DE 274903DA DE 274903 C DE274903 C DE 274903C
- Authority
- DE
- Germany
- Prior art keywords
- contact
- test
- holding relay
- alarm bells
- safety
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
- G08B29/08—Signalling of tampering with the line circuit
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Burglar Alarm Systems (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE274903C true DE274903C (en:Method) |
Family
ID=531234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT274903D Active DE274903C (en:Method) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE274903C (en:Method) |
-
0
- DE DENDAT274903D patent/DE274903C/de active Active
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