NL6805157A - - Google Patents
Info
- Publication number
- NL6805157A NL6805157A NL6805157A NL6805157A NL6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
- Noise Elimination (AREA)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6805157A NL6805157A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1968-04-10 | |
| DE19691914814 DE1914814A1 (de) | 1968-04-10 | 1969-03-22 | Empfaenger fuer Signalisierungssignale mit einer im Gespraechsfrequenzband liegenden Signalisierungsfrequenz |
| US810986A US3588374A (en) | 1968-04-10 | 1969-03-27 | Receiver for signalling signals of a frequency lying in the speech-frequency band |
| SE04949/69A SE332650B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1969-04-08 | |
| GB07896/69A GB1268782A (en) | 1968-04-10 | 1969-04-08 | Transmission system |
| AT339869A AT287069B (de) | 1968-04-10 | 1969-04-08 | Sprachgeschützter Empfänger für Signalisierungssignale mit einer im Gesprächsfrequenzband liegenden Signalisierungsfrequenz |
| BE731266D BE731266A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1969-04-09 | |
| FR6911068A FR2005998A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1969-04-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6805157A NL6805157A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1968-04-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL6805157A true NL6805157A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1969-10-14 |
Family
ID=19803316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL6805157A NL6805157A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1968-04-10 | 1968-04-10 |
Country Status (8)
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2141502B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 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 GB GB07896/69A patent/GB1268782A/en not_active Expired
- 1969-04-08 SE SE04949/69A patent/SE332650B/xx unknown
- 1969-04-08 AT AT339869A patent/AT287069B/de not_active IP Right Cessation
- 1969-04-09 BE BE731266D patent/BE731266A/xx unknown
- 1969-04-10 FR FR6911068A patent/FR2005998A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| BE731266A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1969-10-09 |
| US3588374A (en) | 1971-06-28 |
| GB1268782A (en) | 1972-03-29 |
| DE1914814A1 (de) | 1969-11-06 |
| AT287069B (de) | 1971-01-11 |
| FR2005998A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1969-12-19 |
| SE332650B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1971-02-15 |