NL257575A - - Google Patents
Info
- Publication number
- NL257575A NL257575A NL257575DA NL257575A NL 257575 A NL257575 A NL 257575A NL 257575D A NL257575D A NL 257575DA NL 257575 A NL257575 A NL 257575A
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Exchange Systems With Centralized Control (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1084659 | 1959-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL257575A true NL257575A (US20090163788A1-20090625-C00002.png) |
Family
ID=20292927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL257575D NL257575A (US20090163788A1-20090625-C00002.png) | 1959-11-19 |
Country Status (4)
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1171475B (de) * | 1962-09-14 | 1964-06-04 | Standard Elektrik Lorenz Ag | Zwangslauf-Signalverfahren mit Mehrfrequenz-Codezeichen fuer Fernmelde-, insbesondere Fernsprechanlagen |
| US3288940A (en) * | 1963-10-24 | 1966-11-29 | Automatic Elect Lab | Multifrequency signal receiver |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR959077A (US20090163788A1-20090625-C00002.png) * | 1942-10-31 | 1950-03-23 | ||
| US2767248A (en) * | 1952-06-27 | 1956-10-16 | Siemens Brothers & Co Ltd | Electrically operated registers |
| BE559666A (US20090163788A1-20090625-C00002.png) * | 1956-08-01 | |||
| US2921986A (en) * | 1957-07-15 | 1960-01-19 | Leich Electric Co | Crossbar relay private branch exchange telephone system |
| US2897283A (en) * | 1958-04-18 | 1959-07-28 | Gen Dynamics Corp | Multioffice interlocked signaling telephone system |
-
0
- NL NL257575D patent/NL257575A/xx unknown
-
1960
- 1960-11-02 US US66718A patent/US3198886A/en not_active Expired - Lifetime
- 1960-11-17 DE DET19292A patent/DE1123711B/de active Pending
- 1960-11-21 GB GB40024/60A patent/GB936810A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3198886A (en) | 1965-08-03 |
| GB936810A (en) | 1963-09-11 |
| DE1123711B (de) | 1962-02-15 |
