BE731266A - - Google Patents
Info
- Publication number
- BE731266A BE731266A BE731266DA BE731266A BE 731266 A BE731266 A BE 731266A BE 731266D A BE731266D A BE 731266DA BE 731266 A BE731266 A BE 731266A
- Authority
- BE
- Belgium
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6805157A NL6805157A (https=) | 1968-04-10 | 1968-04-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE731266A true BE731266A (https=) | 1969-10-09 |
Family
ID=19803316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE731266D BE731266A (https=) | 1968-04-10 | 1969-04-09 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3588374A (https=) |
| AT (1) | AT287069B (https=) |
| BE (1) | BE731266A (https=) |
| DE (1) | DE1914814A1 (https=) |
| FR (1) | FR2005998A1 (https=) |
| GB (1) | GB1268782A (https=) |
| NL (1) | NL6805157A (https=) |
| SE (1) | SE332650B (https=) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2141502B1 (https=) * | 1971-06-01 | 1973-06-29 | Ibm France | |
| US4284851A (en) * | 1979-06-29 | 1981-08-18 | Bell Telephone Laboratories, Incorporated | Arrangement for frustrating fraudulent telephone calls |
-
1968
- 1968-04-10 NL NL6805157A patent/NL6805157A/xx unknown
-
1969
- 1969-03-22 DE DE19691914814 patent/DE1914814A1/de active Pending
- 1969-03-27 US US810986A patent/US3588374A/en not_active Expired - Lifetime
- 1969-04-08 SE SE04949/69A patent/SE332650B/xx unknown
- 1969-04-08 AT AT339869A patent/AT287069B/de not_active IP Right Cessation
- 1969-04-08 GB GB07896/69A patent/GB1268782A/en not_active Expired
- 1969-04-09 BE BE731266D patent/BE731266A/xx unknown
- 1969-04-10 FR FR6911068A patent/FR2005998A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AT287069B (de) | 1971-01-11 |
| US3588374A (en) | 1971-06-28 |
| GB1268782A (en) | 1972-03-29 |
| DE1914814A1 (de) | 1969-11-06 |
| SE332650B (https=) | 1971-02-15 |
| FR2005998A1 (https=) | 1969-12-19 |
| NL6805157A (https=) | 1969-10-14 |