SE366449B - - Google Patents
Info
- Publication number
- SE366449B SE366449B SE417572A SE417572A SE366449B SE 366449 B SE366449 B SE 366449B SE 417572 A SE417572 A SE 417572A SE 417572 A SE417572 A SE 417572A SE 366449 B SE366449 B SE 366449B
- Authority
- SE
- Sweden
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
- H04M1/745—Protection devices or circuits for voltages surges on the line
-
- 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)
- Emergency Protection Circuit Devices (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712115757 DE2115757B2 (de) | 1971-03-31 | 1971-03-31 | Schaltungsanordnung zum schutz von ueber anschlussleitungen mit gleichstrom gespeisten einrichtungenin fernmelde-, insbesondere fernsprechanlagen |
| DE19712115670 DE2115670C2 (de) | 1971-03-31 | 1971-03-31 | Schaltungsanordnung für Fernsprechstationen mit überspannungsgeschützten und polungsunabhängigen Mikrofonverstärkern in integrierter monolithischer Technik |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE366449B true SE366449B (en:Method) | 1974-04-22 |
Family
ID=25760899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE417572A SE366449B (en:Method) | 1971-03-31 | 1972-03-29 |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE781592A (en:Method) |
| CH (1) | CH543202A (en:Method) |
| FR (1) | FR2132175B1 (en:Method) |
| GB (1) | GB1348476A (en:Method) |
| IT (1) | IT950824B (en:Method) |
| LU (1) | LU65062A1 (en:Method) |
| NL (1) | NL7203908A (en:Method) |
| SE (1) | SE366449B (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01502953A (ja) * | 1986-04-30 | 1989-10-05 | スタンダード・テレフオンズ・アンド・ケーブルズ・ピー・テイ・ワイ・リミテッド | 電話保護回路 |
-
1972
- 1972-03-07 CH CH328772A patent/CH543202A/de not_active IP Right Cessation
- 1972-03-14 GB GB1172372A patent/GB1348476A/en not_active Expired
- 1972-03-23 NL NL7203908A patent/NL7203908A/xx not_active Application Discontinuation
- 1972-03-28 IT IT2247672A patent/IT950824B/it active
- 1972-03-29 LU LU65062D patent/LU65062A1/xx unknown
- 1972-03-29 SE SE417572A patent/SE366449B/xx unknown
- 1972-03-29 FR FR7211020A patent/FR2132175B1/fr not_active Expired
- 1972-03-31 BE BE781592A patent/BE781592A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1348476A (en) | 1974-03-20 |
| NL7203908A (en:Method) | 1972-10-03 |
| FR2132175B1 (en:Method) | 1973-06-29 |
| LU65062A1 (en:Method) | 1972-07-11 |
| IT950824B (it) | 1973-06-20 |
| FR2132175A1 (en:Method) | 1972-11-17 |
| CH543202A (de) | 1973-10-15 |
| BE781592A (fr) | 1972-10-02 |