BE407035A - - Google Patents
Info
- Publication number
- BE407035A BE407035A BE407035DA BE407035A BE 407035 A BE407035 A BE 407035A BE 407035D A BE407035D A BE 407035DA BE 407035 A BE407035 A BE 407035A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR449609X | 1933-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE407035A true BE407035A (hu) | 1935-01-30 |
Family
ID=8900758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE407035D BE407035A (hu) | 1933-12-30 | 1934-12-27 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2102903A (hu) |
| BE (1) | BE407035A (hu) |
| FR (2) | FR789510A (hu) |
| GB (1) | GB449609A (hu) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE972766C (de) * | 1941-12-14 | 1959-09-24 | Normalzeit G M B H | Sprechanlage mit mehreren Stationen und zentralem Verstaerker |
| CH258989A (de) * | 1942-12-04 | 1948-12-31 | Autophon Ag | Anordnung zum Umschalten der Sprechrichtung in Wechselsprechanlagen für lautstarken Verkehr. |
| CH258725A (de) * | 1942-12-21 | 1948-12-15 | Autophon Ag | Ferneinschaltbarer Selbstanschluss-Fernsprecher für lautstarken Verkehr. |
| US2477275A (en) * | 1944-01-15 | 1949-07-26 | Firm Autophon Ag | Voice-controlled two-way communication system |
| US2427983A (en) * | 1944-03-09 | 1947-09-23 | Autophon Ag | Switching arrangement in duplex loud speaking systems |
| CH250532A (de) * | 1944-10-21 | 1947-08-31 | Autophon Ag | Anordnung in einer Wechselsprechanlage für lautstarken Verkehr. |
| US2451339A (en) * | 1945-02-08 | 1948-10-12 | Automatic Elect Lab | Intercommunicating system |
| US2427850A (en) * | 1945-03-17 | 1947-09-23 | Rca Corp | Switching method and system |
| US2584790A (en) * | 1945-12-18 | 1952-02-05 | Rca Corp | Switching circuit |
| US2694749A (en) * | 1950-04-18 | 1954-11-16 | Sepco 45 B D Sebastopol | Communication system |
| DE1020371B (de) * | 1952-10-15 | 1957-12-05 | Svenska Relaefab Ab | Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der Verkehrsrichtung |
| DE956693C (de) * | 1953-03-19 | 1957-01-24 | Telefunken Gmbh | Schaltungsanordnung fuer Gegensprechanlagen |
| US2819340A (en) * | 1953-11-17 | 1958-01-07 | Stanley S Brody | Voice operated intercommunication system |
| DE958935C (de) * | 1954-02-08 | 1957-02-28 | Telefunken Gmbh | Schaltungsanordnung fuer sprachgesteuerte Echo- und Rueckkopplungssperren in Gegensprechanlagen mit Lautsprecherbetrieb |
| DE1019706B (de) * | 1954-12-14 | 1957-11-21 | Svenska Relaefab Ab | Wechselsprechanlage mit wahlweise durch die Sprechstroeme oder von Hand gesteuerter Umschaltung der UEbertragungsrichtung |
| US3023273A (en) * | 1957-09-25 | 1962-02-27 | Liberman Arie | Communication system |
| US3439121A (en) * | 1965-09-30 | 1969-04-15 | Bell Telephone Labor Inc | Multiple channel loud-speaking telephone |
-
1934
- 1934-08-03 FR FR789510D patent/FR789510A/fr not_active Expired
- 1934-12-24 GB GB36952/34A patent/GB449609A/en not_active Expired
- 1934-12-27 US US759407A patent/US2102903A/en not_active Expired - Lifetime
- 1934-12-27 BE BE407035D patent/BE407035A/xx unknown
-
1935
- 1935-04-17 FR FR46765D patent/FR46765E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR46765E (fr) | 1936-09-11 |
| FR789510A (fr) | 1935-10-30 |
| US2102903A (en) | 1937-12-21 |
| GB449609A (en) | 1936-06-24 |