NL75769C - - Google Patents
Info
- Publication number
- NL75769C NL75769C NL75769DA NL75769C NL 75769 C NL75769 C NL 75769C NL 75769D A NL75769D A NL 75769DA NL 75769 C NL75769 C NL 75769C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Emergency Protection Circuit Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR272716X | 1947-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL75769C true NL75769C (en) |
Family
ID=8886075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL75769D NL75769C (en) | 1947-06-26 |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH272716A (en) |
| GB (1) | GB668460A (en) |
| NL (1) | NL75769C (en) |
-
0
- NL NL75769D patent/NL75769C/xx active
-
1948
- 1948-03-30 CH CH272716D patent/CH272716A/en unknown
- 1948-04-15 GB GB5001/51A patent/GB668460A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB668460A (en) | 1952-03-19 |
| CH272716A (en) | 1950-12-31 |