BE504009A - - Google Patents
Info
- Publication number
- BE504009A BE504009A BE504009DA BE504009A BE 504009 A BE504009 A BE 504009A BE 504009D A BE504009D A BE 504009DA BE 504009 A BE504009 A BE 504009A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Rectifiers (AREA)
- Electronic Switches (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US174943A US2674734A (en) | 1950-07-20 | 1950-07-20 | Electronic ringing frequency generator |
| US31365452 US2740948A (en) | 1950-07-20 | 1952-10-08 | Electronic ringing frequency generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE504009A true BE504009A (xx) | 1900-01-01 |
Family
ID=26870698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE504009D BE504009A (xx) | 1950-07-20 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2740948A (xx) |
| BE (1) | BE504009A (xx) |
| GB (1) | GB687632A (xx) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2810841A (en) * | 1955-10-13 | 1957-10-22 | Gen Dynamics Corp | Pulse generator |
| US3012226A (en) * | 1956-11-14 | 1961-12-05 | Bell Telephone Labor Inc | Selective signaling device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1105492A (en) * | 1914-04-28 | 1914-07-28 | Edward E Clement | Telephone-exchange system. |
| US1957672A (en) * | 1927-03-30 | 1934-05-08 | Associated Electric Lab Inc | Telephone system |
| US1904929A (en) * | 1931-09-03 | 1933-04-18 | Associated Electric Lab Inc | Relay system |
| US2122499A (en) * | 1934-09-27 | 1938-07-05 | Rca Corp | Switching device |
| US2188159A (en) * | 1937-05-21 | 1940-01-23 | Bell Telephone Labor Inc | Gas-filled space discharge tube circuits |
| US2168198A (en) * | 1937-12-17 | 1939-08-01 | Frederick W Frink | Electrical counting system |
| US2359967A (en) * | 1941-12-29 | 1944-10-10 | Automatic Elect Lab | Timing arrangement |
| US2583792A (en) * | 1948-05-22 | 1952-01-29 | Lloyd E Nelson | Timer circuit |
| US2600729A (en) * | 1949-12-22 | 1952-06-17 | Kellogg Switchboard & Supply | Endless chain of counting relays |
-
0
- BE BE504009D patent/BE504009A/xx unknown
-
1951
- 1951-04-12 GB GB855751A patent/GB687632A/en not_active Expired
-
1952
- 1952-10-08 US US31365452 patent/US2740948A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2740948A (en) | 1956-04-03 |
| GB687632A (en) | 1953-02-18 |