NL260795A - - Google Patents
Info
- Publication number
- NL260795A NL260795A NL260795DA NL260795A NL 260795 A NL260795 A NL 260795A NL 260795D A NL260795D A NL 260795DA NL 260795 A NL260795 A NL 260795A
- Authority
- NL
- Netherlands
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET19238A DE1195816B (de) | 1960-11-05 | 1960-11-05 | Schaltungsanordnung fuer einen mikrofoniearmen Teilnehmerapparat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL260795A true NL260795A (en:Method) |
Family
ID=7549244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL260795D NL260795A (en:Method) | 1960-11-05 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1195816B (en:Method) |
| GB (1) | GB907374A (en:Method) |
| NL (1) | NL260795A (en:Method) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1278526B (de) * | 1963-08-31 | 1968-09-26 | Standard Elektrik Lorenz Ag | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen ueber einen anrufbereiten Fernsprechapparat |
| US3997737A (en) * | 1974-11-27 | 1976-12-14 | San/Bar Corporation | Security line card circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1110233B (de) * | 1959-02-10 | 1961-07-06 | Siemens Ag | Schaltungsanordnung zur Verhinderung des Abhoerens von Gespraechen |
-
0
- NL NL260795D patent/NL260795A/xx unknown
-
1960
- 1960-11-05 DE DET19238A patent/DE1195816B/de active Pending
-
1961
- 1961-06-22 GB GB2264461A patent/GB907374A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB907374A (en) | 1962-10-03 |
| DE1195816B (de) | 1965-07-01 |