BE563970A - - Google Patents
Info
- Publication number
- BE563970A BE563970A BE563970DA BE563970A BE 563970 A BE563970 A BE 563970A BE 563970D A BE563970D A BE 563970DA BE 563970 A BE563970 A BE 563970A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
- H04M3/64—Arrangements for signalling the number or class of the calling line to the operator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/62—Constructional arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephone Function (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US634184A US3028452A (en) | 1957-01-15 | 1957-01-15 | Loudspeaking telephone using transistors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE563970A true BE563970A (US07981874-20110719-C00152.png) |
Family
ID=24542755
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE565189D BE565189A (US07981874-20110719-C00152.png) | 1957-01-15 | ||
| BE563970D BE563970A (US07981874-20110719-C00152.png) | 1957-01-15 |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE565189D BE565189A (US07981874-20110719-C00152.png) | 1957-01-15 |
Country Status (6)
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE558459A (US07981874-20110719-C00152.png) * | 1956-06-19 | |||
| BE563510A (US07981874-20110719-C00152.png) * | 1956-12-28 | |||
| NL225471A (US07981874-20110719-C00152.png) * | 1957-11-26 | 1900-01-01 | ||
| US3080454A (en) * | 1959-07-06 | 1963-03-05 | Gai Tronics Corp | Intra-plant voice communication system |
| US3136864A (en) * | 1959-10-05 | 1964-06-09 | Automatic Elect Lab | Loudspeaking telephone with electronic voice switching |
| DE1120510B (de) * | 1959-11-12 | 1961-12-28 | Telefonbau & Normalzeit Gmbh | Schaltungsanordnung fuer Fernsprechteilnehmerstationen mit Sprech- und Hoerverstaerkern |
| NL254433A (US07981874-20110719-C00152.png) * | 1960-08-01 | |||
| US3165590A (en) * | 1961-12-29 | 1965-01-12 | Bell Telephone Labor Inc | Speech transmission through telephone ringing circuit |
| NO120997B (US07981874-20110719-C00152.png) * | 1964-10-19 | 1971-01-04 | Ring System Maskiner Gustav | |
| US3553382A (en) * | 1967-08-04 | 1971-01-05 | Edward R Edelberg | Toll call signalling and diverting system |
| SE336609B (US07981874-20110719-C00152.png) * | 1969-10-30 | 1971-07-12 | Ericsson Telefon Ab L M | |
| US3908094A (en) * | 1971-12-15 | 1975-09-23 | Central Telephone S A | Telephone transceiver with amplified microphone and speaker |
| US3906168A (en) * | 1973-12-12 | 1975-09-16 | Bell Telephone Labor Inc | Visual status indicator circuit |
| US3959602A (en) * | 1974-11-19 | 1976-05-25 | Bell Telephone Laboratories, Incorporated | Telephone substation circuit |
| JPS5665563A (en) * | 1979-11-02 | 1981-06-03 | Canon Inc | Display device for state of telephone line |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1956360A (en) * | 1931-05-11 | 1934-04-24 | Associated Electric Lab Inc | Telephone instrument |
| US2214992A (en) * | 1936-05-27 | 1940-09-17 | Chevassus Gustave | Receiver and transmitter for telephone desk sets |
| US2337900A (en) * | 1940-11-29 | 1943-12-28 | Bell Telephone Labor Inc | Telephone apparatus |
| DE887222C (de) * | 1945-02-01 | 1953-08-20 | Aeg | Verfahren zur Stromversorgung fuer Verstaerkereinrichtungen bei Fernsprechstellen |
| US2542921A (en) * | 1945-07-02 | 1951-02-20 | Automatic Elect Lab | Signal operated control for twochannel transmission systems |
| CH271525A (fr) * | 1948-04-21 | 1950-10-31 | Kaelin Pierre | Poste pour installation de transmission du son. |
| NL148695B (nl) * | 1948-11-06 | Conch Int Methane Ltd | Thermisch geisoleerde houder. | |
| DE887956C (de) * | 1950-12-27 | 1953-08-27 | Western Electric Co | Schaltungsanordnung zur Regelung des UEbertragungspegels fuer Fernsprechteilnehmerstellen |
| US2629024A (en) * | 1950-12-29 | 1953-02-17 | Bell Telephone Labor Inc | Unbalanced-to-ground two-to-fourwire connection |
| GB743024A (en) * | 1953-07-01 | 1956-01-04 | Gen Electric Co Ltd | Improvements in or relating to telephone apparatus |
| US2786099A (en) * | 1954-02-09 | 1957-03-19 | Donald C Beatty | Sound amplifying apparatus for telephone circuits |
| US2785231A (en) * | 1954-02-25 | 1957-03-12 | Bell Telephone Labor Inc | Telephone set with amplifier |
| BE539848A (US07981874-20110719-C00152.png) * | 1954-07-16 | |||
| US2772410A (en) * | 1954-09-30 | 1956-11-27 | Ibm | Transistor indicator circuit |
| US2776420A (en) * | 1954-11-01 | 1957-01-01 | Rca Corp | Transistor indicator circuits |
| US2844658A (en) * | 1955-11-23 | 1958-07-22 | Int Standard Electric Corp | Arrangement for telephones with an amplifying device connected in series with the receiver capsule |
| US2885484A (en) * | 1956-11-28 | 1959-05-05 | Gen Telephone Lab Inc | Telephone apparatus employing transistor amplifiers |
-
0
- US US3141068D patent/US3141068A/en not_active Expired - Lifetime
- BE BE565189D patent/BE565189A/xx unknown
- BE BE563970D patent/BE563970A/xx unknown
-
1957
- 1957-01-15 US US634184A patent/US3028452A/en not_active Expired - Lifetime
- 1957-03-20 US US647421A patent/US2885478A/en not_active Expired - Lifetime
- 1957-12-30 GB GB40317/57A patent/GB858678A/en not_active Expired
-
1958
- 1958-01-10 CH CH5455558A patent/CH363378A/de unknown
- 1958-01-13 FR FR755730A patent/FR1224034A/fr not_active Expired
- 1958-01-14 DE DEG23715A patent/DE1130474B/de active Pending
- 1958-02-24 FR FR758932A patent/FR73379E/fr not_active Expired
- 1958-02-25 CH CH5629658A patent/CH368527A/de unknown
- 1958-03-15 DE DEG24104A patent/DE1135964B/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US2885478A (en) | 1959-05-05 |
| BE565189A (US07981874-20110719-C00152.png) | |
| CH363378A (de) | 1962-07-31 |
| FR1224034A (fr) | 1960-06-21 |
| CH368527A (de) | 1963-04-15 |
| US3028452A (en) | 1962-04-03 |
| FR73379E (fr) | 1960-06-27 |
| US3141068A (en) | 1964-07-14 |
| DE1135964B (de) | 1962-09-06 |
| DE1130474B (de) | 1962-05-30 |
| GB858678A (en) | 1961-01-11 |
