DE191346C - - Google Patents
Info
- Publication number
- DE191346C DE191346C DENDAT191346D DE191346DA DE191346C DE 191346 C DE191346 C DE 191346C DE NDAT191346 D DENDAT191346 D DE NDAT191346D DE 191346D A DE191346D A DE 191346DA DE 191346 C DE191346 C DE 191346C
- Authority
- DE
- Germany
- Prior art keywords
- subscriber
- contact
- speaking
- office
- relay
- 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
- 239000004020 conductor Substances 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
- H04M1/70—Lock-out or secrecy arrangements in party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE191346C true DE191346C (cs) |
Family
ID=454751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT191346D Active DE191346C (cs) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE191346C (cs) |
-
0
- DE DENDAT191346D patent/DE191346C/de active Active
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