BE435741A - - Google Patents
Info
- Publication number
- BE435741A BE435741A BE435741DA BE435741A BE 435741 A BE435741 A BE 435741A BE 435741D A BE435741D A BE 435741DA BE 435741 A BE435741 A BE 435741A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
-
- 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)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL95329A DE707378C (en) | 1938-08-03 | 1938-08-03 | Circuit arrangement for telemedicine systems in which the signals are given by alternating currents of a specific frequency sequence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE435741A true BE435741A (en) |
Family
ID=27797495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE435741D BE435741A (en) | 1938-08-03 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2208928A (en) |
| BE (1) | BE435741A (en) |
| CH (1) | CH212535A (en) |
| DE (1) | DE707378C (en) |
| FR (1) | FR858526A (en) |
| NL (1) | NL56885C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE960737C (en) * | 1951-02-24 | 1957-04-18 | Siemens Ag | Circuit arrangement for telephone systems in which alternating currents are used for signaling within the voice band |
| US5528682A (en) * | 1995-01-30 | 1996-06-18 | Harris Corporation | Double duty capacitor circuit and method |
-
0
- BE BE435741D patent/BE435741A/xx unknown
- NL NL56885D patent/NL56885C/xx active
-
1938
- 1938-08-03 DE DEL95329A patent/DE707378C/en not_active Expired
-
1939
- 1939-07-29 US US287198A patent/US2208928A/en not_active Expired - Lifetime
- 1939-07-31 FR FR858526D patent/FR858526A/en not_active Expired
- 1939-07-31 CH CH212535D patent/CH212535A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR858526A (en) | 1940-11-27 |
| NL56885C (en) | |
| US2208928A (en) | 1940-07-23 |
| CH212535A (en) | 1940-11-30 |
| DE707378C (en) | 1941-06-20 |