BE541780A - - Google Patents
Info
- Publication number
- BE541780A BE541780A BE541780DA BE541780A BE 541780 A BE541780 A BE 541780A BE 541780D A BE541780D A BE 541780DA BE 541780 A BE541780 A BE 541780A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US460574A US2885483A (en) | 1954-10-06 | 1954-10-06 | Telephone instrument utilizing transistor amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE541780A true BE541780A (de) |
Family
ID=23829261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE541780D BE541780A (de) | 1954-10-06 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2885483A (de) |
| BE (1) | BE541780A (de) |
| DE (1) | DE1093416B (de) |
| FR (1) | FR1154422A (de) |
| GB (1) | GB781135A (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE559221A (de) * | 1956-07-26 | |||
| US3080454A (en) * | 1959-07-06 | 1963-03-05 | Gai Tronics Corp | Intra-plant voice communication system |
| NL254433A (de) * | 1960-08-01 | |||
| US3413417A (en) * | 1965-03-30 | 1968-11-26 | Rca Corp | Auxiliary earphone circuit for a high voltage transistor amplifier |
| US3743784A (en) * | 1971-11-19 | 1973-07-03 | Olympus Optical Co | Electrical attachment device |
| US4151376A (en) * | 1977-01-24 | 1979-04-24 | Walker Equipment & Service Co. | Amplifier for telephone handset |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1654929A (en) * | 1923-12-15 | 1928-01-03 | Western Electric Co | Amplifier circuits |
| US1655537A (en) * | 1926-01-18 | 1928-01-10 | Western Electric Co | Amplifier circuits |
| US1696274A (en) * | 1926-11-30 | 1928-12-25 | Bell Telephone Labor Inc | Substation circuits |
| US2059714A (en) * | 1934-08-03 | 1936-11-03 | Associated Electric Lab Inc | Hand telephone |
| US2186072A (en) * | 1936-06-22 | 1940-01-09 | Aurex Corp | Head phone |
| US2341539A (en) * | 1941-11-14 | 1944-02-15 | Automatic Elect Lab | Loud-speaking telephone system |
| US2332430A (en) * | 1942-07-16 | 1943-10-19 | Bell Telephone Labor Inc | Two-way telephone system |
| DE872562C (de) * | 1944-08-12 | 1953-04-02 | Siemens Ag | Relaisanordnung zum Einschalten von Gleichstromverbrauchern mit richtiger Polaritaet |
| US2535681A (en) * | 1946-08-07 | 1950-12-26 | Bell Telephone Labor Inc | Electroacoustic system and means |
| US2660624A (en) * | 1949-02-24 | 1953-11-24 | Rca Corp | High input impedance semiconductor amplifier |
| GB679875A (en) * | 1949-03-16 | 1952-09-24 | Siemens Ag | Improvements in or relating to an arrangement for telephone subscribers sets |
| NL163637B (nl) * | 1950-09-12 | Information Storage Systems | Inrichting voor het instellen van een voorwerp met behulp van een motor. | |
| US2641327A (en) * | 1950-10-13 | 1953-06-09 | Soundscriber Corp | Acoustic ear pendant |
| DE862917C (de) * | 1951-07-12 | 1953-01-15 | Siemens Ag | Fernsprechstation mit Kohlemikrofon und Speisung vom Amt |
| US2762875A (en) * | 1952-11-15 | 1956-09-11 | Rca Corp | Stabilized cascade-connected semi-conductor amplifier circuits and the like |
| US2787670A (en) * | 1953-02-27 | 1957-04-02 | Douglas H Rowland | Hearing aid |
| US2762867A (en) * | 1953-06-16 | 1956-09-11 | Bell Telephone Labor Inc | Subscriber telephone circuit |
| US2760007A (en) * | 1953-08-06 | 1956-08-21 | Bell Telephone Labor Inc | Two-stage transistor feedback amplifier |
| US2785231A (en) * | 1954-02-25 | 1957-03-12 | Bell Telephone Labor Inc | Telephone set with amplifier |
-
0
- BE BE541780D patent/BE541780A/xx unknown
-
1954
- 1954-10-06 US US460574A patent/US2885483A/en not_active Expired - Lifetime
-
1955
- 1955-09-30 DE DEA23494A patent/DE1093416B/de active Pending
- 1955-10-03 FR FR1154422D patent/FR1154422A/fr not_active Expired
- 1955-10-06 GB GB28543/55A patent/GB781135A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB781135A (en) | 1957-08-14 |
| DE1093416B (de) | 1960-11-24 |
| US2885483A (en) | 1959-05-05 |
| FR1154422A (fr) | 1958-04-10 |