NL54520C - - Google Patents
Info
- Publication number
- NL54520C NL54520C NL54520DA NL54520C NL 54520 C NL54520 C NL 54520C NL 54520D A NL54520D A NL 54520DA NL 54520 C NL54520 C NL 54520C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Keying Circuit Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE216839X | 1939-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL54520C true NL54520C (en:Method) |
Family
ID=5830416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL54520D NL54520C (en:Method) | 1939-07-19 |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH216839A (en:Method) |
| NL (1) | NL54520C (en:Method) |
-
0
- NL NL54520D patent/NL54520C/xx active
-
1940
- 1940-05-24 CH CH216839D patent/CH216839A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH216839A (de) | 1941-09-15 |