BE493860A - - Google Patents
Info
- Publication number
- BE493860A BE493860A BE493860DA BE493860A BE 493860 A BE493860 A BE 493860A BE 493860D A BE493860D A BE 493860DA BE 493860 A BE493860 A BE 493860A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication
-
- 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
-
- 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)
- Signal Processing (AREA)
- Meter Arrangements (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE279121X | 1949-02-16 | ||
DE250749X | 1949-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE493860A true BE493860A (zh) |
Family
ID=25768521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE493860D BE493860A (zh) | 1949-02-16 |
Country Status (4)
Country | Link |
---|---|
US (1) | US2988600A (zh) |
BE (1) | BE493860A (zh) |
CH (1) | CH279121A (zh) |
GB (1) | GB704749A (zh) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1723153A (en) * | 1928-06-20 | 1929-08-06 | American Telephone & Telegraph | Telephone system |
US1834393A (en) * | 1930-02-12 | 1931-12-01 | Bell Telephone Labor Inc | Telephone exchange system |
GB475419A (en) * | 1936-05-18 | 1937-11-18 | Automatic Electric Co Ltd | Improvements in or relating to telephone systems |
US2282911A (en) * | 1938-04-12 | 1942-05-12 | Fides Ges Fur Die Verwaltung A | Telephone system |
-
0
- BE BE493860D patent/BE493860A/xx unknown
-
1950
- 1950-02-10 CH CH279121D patent/CH279121A/de unknown
- 1950-02-16 GB GB4039/50A patent/GB704749A/en not_active Expired
-
1955
- 1955-05-20 US US509998A patent/US2988600A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2988600A (en) | 1961-06-13 |
CH279121A (de) | 1951-11-15 |
GB704749A (en) | 1954-03-03 |