NL49757C - - Google Patents
Info
- Publication number
- NL49757C NL49757C NL49757DA NL49757C NL 49757 C NL49757 C NL 49757C NL 49757D A NL49757D A NL 49757DA NL 49757 C NL49757 C NL 49757C
- 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
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB230160X | 1936-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL49757C true NL49757C (en:Method) |
Family
ID=10188719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL49757D NL49757C (en:Method) | 1936-08-14 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE422659A (en:Method) |
| CH (1) | CH230160A (en:Method) |
| FR (1) | FR825569A (en:Method) |
| GB (1) | GB479881A (en:Method) |
| NL (1) | NL49757C (en:Method) |
-
0
- BE BE422659D patent/BE422659A/xx unknown
- NL NL49757D patent/NL49757C/xx active
-
1936
- 1936-08-14 GB GB22461/36A patent/GB479881A/en not_active Expired
-
1937
- 1937-08-13 FR FR825569D patent/FR825569A/fr not_active Expired
- 1937-08-14 CH CH230160D patent/CH230160A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE422659A (en:Method) | |
| FR825569A (fr) | 1938-03-07 |
| GB479881A (en) | 1938-02-14 |
| CH230160A (de) | 1943-12-15 |