NL252835A - - Google Patents
Info
- Publication number
- NL252835A NL252835A NL252835DA NL252835A NL 252835 A NL252835 A NL 252835A NL 252835D A NL252835D A NL 252835DA NL 252835 A NL252835 A NL 252835A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Selective Calling Equipment (AREA)
- Radio Relay Systems (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES63578A DE1086760B (de) | 1959-06-23 | 1959-06-23 | Schaltungsanordnung fuer Fernmelde-, insbesondere Fernsprechanlagen mit Frequenz-Kodewahl |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL252835A true NL252835A (US20020128544A1-20020912-P00008.png) |
Family
ID=7496479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL252835D NL252835A (US20020128544A1-20020912-P00008.png) | 1959-06-23 |
Country Status (6)
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE466455A (US20020128544A1-20020912-P00008.png) * | 1942-04-28 | |||
| US2332912A (en) * | 1942-05-01 | 1943-10-26 | Bell Telephone Labor Inc | Telephone system |
| US2554201A (en) * | 1946-06-19 | 1951-05-22 | Ericsson Telefon Ab L M | Key-sending automatic telephone signaling system |
| US2470145A (en) * | 1947-09-25 | 1949-05-17 | American Telephone & Telegraph | Multifrequency signaling system |
| US2966659A (en) * | 1953-12-30 | 1960-12-27 | Bell Telephone Labor Inc | Signaling system |
| NL96910C (US20020128544A1-20020912-P00008.png) * | 1954-10-25 | |||
| DE1047872B (de) * | 1956-08-16 | 1958-12-31 | Standard Elektrik Lorenz Ag | Verfahren zur UEbertragung von Schaltauftraegen, die aus einer Reihe von einzelnen Teilauftraegen zusammengesetzt sind, in Fernmelde-, insbesondere Fernsprechanlagen |
| DE1047873B (de) * | 1958-02-01 | 1958-12-31 | Standard Elektrik Lorenz Ag | Verfahren zur UEbertragung mehrstelliger Informationen mittels Frequenzkombinationenin Fernmelde-, insbesondere Fernsprechanlagen |
-
0
- NL NL252835D patent/NL252835A/xx unknown
-
1959
- 1959-06-23 DE DES63578A patent/DE1086760B/de active Pending
-
1960
- 1960-06-15 GB GB21108/60A patent/GB926679A/en not_active Expired
- 1960-06-20 BE BE592089A patent/BE592089A/fr unknown
- 1960-06-22 CH CH709460A patent/CH379585A/de unknown
- 1960-06-22 US US37869A patent/US3140356A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB926679A (en) | 1963-05-22 |
| BE592089A (fr) | 1960-10-17 |
| US3140356A (en) | 1964-07-07 |
| CH379585A (de) | 1964-07-15 |
| DE1086760B (de) | 1960-08-11 |
