NL31949C - - Google Patents
Info
- Publication number
- NL31949C NL31949C NL31949DA NL31949C NL 31949 C NL31949 C NL 31949C NL 31949D A NL31949D A NL 31949DA NL 31949 C NL31949 C NL 31949C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Near-Field Transmission Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE315888X | 1928-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL31949C true NL31949C (xx) |
Family
ID=6150330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL31949D NL31949C (xx) | 1928-07-21 |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH151520A (xx) |
| FR (1) | FR678726A (xx) |
| GB (1) | GB315888A (xx) |
| NL (1) | NL31949C (xx) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2756282A (en) * | 1953-01-12 | 1956-07-24 | Sierra Electronic Corp | Directional amplifier system and apparatus |
| US3426298A (en) * | 1966-04-19 | 1969-02-04 | Anzac Electronics Inc | Broadband directional coupler |
| US4121180A (en) * | 1976-12-27 | 1978-10-17 | Technical Research And Manufacturing, Inc. | Broadband directional coupler |
-
0
- NL NL31949D patent/NL31949C/xx active
-
1929
- 1929-07-18 FR FR678726D patent/FR678726A/fr not_active Expired
- 1929-07-20 GB GB22385/29A patent/GB315888A/en not_active Expired
- 1929-07-20 CH CH151520D patent/CH151520A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR678726A (fr) | 1930-04-03 |
| CH151520A (de) | 1931-12-15 |
| GB315888A (en) | 1930-10-20 |