NL3569C - - Google Patents
Info
- Publication number
- NL3569C NL3569C NL3569DA NL3569C NL 3569 C NL3569 C NL 3569C NL 3569D A NL3569D A NL 3569DA NL 3569 C NL3569 C NL 3569C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
- H04M3/62—Keyboard equipment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Meter Arrangements (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE191407327X | 1913-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL3569C true NL3569C (https=) |
Family
ID=32604936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL3569D NL3569C (https=) | 1913-03-25 |
Country Status (3)
| Country | Link |
|---|---|
| DE (2) | DE293878C (https=) |
| GB (1) | GB191407327A (https=) |
| NL (1) | NL3569C (https=) |
-
0
- DE DENDAT292386D patent/DE292386C/de active Active
- DE DENDAT293878D patent/DE293878C/de active Active
- NL NL3569D patent/NL3569C/xx active
-
1914
- 1914-03-23 GB GB191407327D patent/GB191407327A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB191407327A (en) | 1915-06-17 |
| DE292386C (https=) | |
| DE293878C (https=) |