NL58054C - - Google Patents
Info
- Publication number
- NL58054C NL58054C NL58054DA NL58054C NL 58054 C NL58054 C NL 58054C NL 58054D A NL58054D A NL 58054DA NL 58054 C NL58054 C NL 58054C
- 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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
- H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection
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 |
|---|---|---|---|
| GB1510238A GB516114A (en) | 1938-05-20 | 1938-05-20 | Improvements in or relating to alternating current signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL58054C true NL58054C (US07122603-20061017-C00294.png) |
Family
ID=10053070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL58054D NL58054C (US07122603-20061017-C00294.png) | 1938-05-20 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE434428A (US07122603-20061017-C00294.png) |
| FR (1) | FR854916A (US07122603-20061017-C00294.png) |
| GB (1) | GB516114A (US07122603-20061017-C00294.png) |
| NL (1) | NL58054C (US07122603-20061017-C00294.png) |
-
0
- BE BE434428D patent/BE434428A/xx unknown
- NL NL58054D patent/NL58054C/xx active
-
1938
- 1938-05-20 GB GB1510238A patent/GB516114A/en not_active Expired
-
1939
- 1939-05-17 FR FR854916D patent/FR854916A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR854916A (fr) | 1940-04-27 |
| BE434428A (US07122603-20061017-C00294.png) | |
| GB516114A (en) | 1939-12-22 |
