JPS4866705A - - Google Patents
Info
- Publication number
- JPS4866705A JPS4866705A JP47122638A JP12263872A JPS4866705A JP S4866705 A JPS4866705 A JP S4866705A JP 47122638 A JP47122638 A JP 47122638A JP 12263872 A JP12263872 A JP 12263872A JP S4866705 A JPS4866705 A JP S4866705A
- Authority
- JP
- Japan
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/006—Circuits for increasing the range of current supply source
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00206692A US3819877A (en) | 1971-12-10 | 1971-12-10 | Centralized network for a telephone station system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS4866705A true JPS4866705A (ja) | 1973-09-12 |
Family
ID=22767525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP47122638A Pending JPS4866705A (ja) | 1971-12-10 | 1972-12-08 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3819877A (ja) |
| JP (1) | JPS4866705A (ja) |
| CA (1) | CA951844A (ja) |
| SE (1) | SE377415B (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6377251A (ja) * | 1986-09-20 | 1988-04-07 | Fujitsu Ltd | 通話増幅装置 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6249147B1 (en) | 1999-03-09 | 2001-06-19 | Fujitsu, Ltd. | Method and apparatus for high speed on-chip signal propagation |
| US8030966B2 (en) * | 2008-04-30 | 2011-10-04 | Richards Ernest S | Very high efficiency transmission line driver |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2721897A (en) * | 1951-01-13 | 1955-10-25 | Bell Telephone Labor Inc | Carrier wave communication system |
| BE531756A (ja) * | 1953-09-11 | |||
| GB872000A (en) * | 1958-04-23 | 1961-07-05 | Ass Elect Ind | Improvements relating to regulated power supply arrangements |
| FR1243043A (fr) * | 1958-09-19 | 1960-10-07 | Montage pour postes téléphoniques à l'intérieur d'une installation téléphonique | |
| US3083265A (en) * | 1960-02-01 | 1963-03-26 | Itt | Conference call circuit |
| BE626509A (ja) * | 1961-12-29 | |||
| US3483335A (en) * | 1966-11-04 | 1969-12-09 | Itt | Equalizer circuitry utilizing photoresistors |
| US3524929A (en) * | 1967-06-29 | 1970-08-18 | Automatic Elect Lab | Telephone conference circuit |
-
1971
- 1971-12-10 US US00206692A patent/US3819877A/en not_active Expired - Lifetime
-
1972
- 1972-06-20 CA CA145,189,A patent/CA951844A/en not_active Expired
- 1972-12-01 SE SE7215723A patent/SE377415B/xx unknown
- 1972-12-08 JP JP47122638A patent/JPS4866705A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6377251A (ja) * | 1986-09-20 | 1988-04-07 | Fujitsu Ltd | 通話増幅装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CA951844A (en) | 1974-07-23 |
| SE377415B (ja) | 1975-06-30 |
| US3819877A (en) | 1974-06-25 |