NL97209C - - Google Patents
Info
- Publication number
- NL97209C NL97209C NL97209DC NL97209C NL 97209 C NL97209 C NL 97209C NL 97209D C NL97209D C NL 97209DC NL 97209 C NL97209 C NL 97209C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE333371X | 1954-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL97209C true NL97209C (en:Method) |
Family
ID=20308163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL97209D NL97209C (en:Method) | 1954-02-24 |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE535941A (en:Method) |
| CH (1) | CH333371A (en:Method) |
| DE (1) | DE1049430B (en:Method) |
| FR (1) | FR1134321A (en:Method) |
| GB (1) | GB779172A (en:Method) |
| NL (1) | NL97209C (en:Method) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE565494A (en:Method) * | 1957-11-26 | 1900-01-01 | ||
| DE1211271B (de) * | 1961-06-08 | 1966-02-24 | Ericsson Telefon Ab L M | Schaltungsanordnung fuer eine sprachgesteuerte Gegen- oder Wechselsprechanlage mit Freisprechbetrieb |
| GB1011962A (en) * | 1963-05-14 | 1965-12-01 | Northern Electric Co | Improvements in or relating to electrical control circuits |
-
0
- BE BE535941D patent/BE535941A/xx unknown
- NL NL97209D patent/NL97209C/xx active
- DE DENDAT1049430D patent/DE1049430B/de active Pending
-
1955
- 1955-02-12 CH CH333371D patent/CH333371A/de unknown
- 1955-02-15 GB GB4551/55A patent/GB779172A/en not_active Expired
- 1955-02-22 FR FR1134321D patent/FR1134321A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1134321A (fr) | 1957-04-10 |
| GB779172A (en) | 1957-07-17 |
| BE535941A (en:Method) | |
| CH333371A (de) | 1958-10-15 |
| DE1049430B (de) | 1959-01-29 |