BE559221A - - Google Patents
Info
- Publication number
- BE559221A BE559221A BE559221DA BE559221A BE 559221 A BE559221 A BE 559221A BE 559221D A BE559221D A BE 559221DA BE 559221 A BE559221 A BE 559221A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
-
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE834203X | 1956-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE559221A true BE559221A (US20100012521A1-20100121-C00001.png) |
Family
ID=20354022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE559221D BE559221A (US20100012521A1-20100121-C00001.png) | 1956-07-26 |
Country Status (4)
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1082300B (de) * | 1959-06-04 | 1960-05-25 | Siemens Ag | Schaltungsanordnung fuer Teilnehmerstellen in Fernmelde-, insbesondere Fernsprech-anlagen mit Tastaturwahl |
| USRE25507E (en) * | 1959-12-16 | 1964-01-07 | Frequency - cps | |
| DE1128472B (de) * | 1960-10-12 | 1962-04-26 | Siemens Ag | Schaltungsanordnung fuer Teilnehmerstellen, insbesondere an Gesellschaftsleitungen, in Fernmelde-, insbesondere Fernsprech-anlagen, zur Anwendung von tonfrequenten Kennzeichen |
| FR81782E (US20100012521A1-20100121-C00001.png) * | 1961-06-19 | 1964-01-31 | ||
| DE1190063B (de) * | 1963-10-25 | 1965-04-01 | Standard Elektrik Lorenz Ag | Schaltungsanordnung fuer Fernsprech-, insbesondere Fernsprechnebenstellenanlagen |
| DE1201417B (de) * | 1964-07-10 | 1965-09-23 | Standard Elektrik Lorenz Ag | Tonfrequentes Tastwahlverfahren ohne Gleichstrom-Wahlbegleitzeichen in Fernmelde-, insbesondere Fernsprechanlagen und Schaltungsanordnung zur Durchfuehrung des Verfahrens |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2405211A (en) * | 1942-07-16 | 1946-08-06 | Bell Telephone Labor Inc | Communication system |
| US2438496A (en) * | 1944-05-01 | 1948-03-30 | Int Standard Electric Corp | Telephone system employing key type call transmitter |
| US2554201A (en) * | 1946-06-19 | 1951-05-22 | Ericsson Telefon Ab L M | Key-sending automatic telephone signaling system |
| US2697749A (en) * | 1951-06-20 | 1954-12-21 | Bell Telephone Labor Inc | Multifrequency telephone switching system |
| US2713617A (en) * | 1952-07-10 | 1955-07-19 | Bell Telephone Labor Inc | Repetitive telephone calling system employing power supplied over the subscriber's loop |
| BE541780A (US20100012521A1-20100121-C00001.png) * | 1954-10-06 |
-
0
- BE BE559221D patent/BE559221A/xx unknown
-
1957
- 1957-07-08 US US670410A patent/US3065305A/en not_active Expired - Lifetime
- 1957-07-10 DE DET13857A patent/DE1036939B/de active Pending
- 1957-07-18 GB GB32808/58A patent/GB834204A/en not_active Expired
- 1957-07-18 GB GB22804/57A patent/GB834203A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1036939B (de) | 1958-08-21 |
| US3065305A (en) | 1962-11-20 |
| GB834203A (en) | 1960-05-04 |
| GB834204A (en) | 1960-05-04 |
