FR939445A - Telephone systems - Google Patents
Telephone systemsInfo
- Publication number
- FR939445A FR939445A FR939445DA FR939445A FR 939445 A FR939445 A FR 939445A FR 939445D A FR939445D A FR 939445DA FR 939445 A FR939445 A FR 939445A
- Authority
- FR
- France
- Prior art keywords
- telephone systems
- telephone
- systems
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939445X | 1939-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR939445A true FR939445A (en) | 1948-11-15 |
Family
ID=10748278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR939445D Expired FR939445A (en) | 1939-03-17 | 1946-12-20 | Telephone systems |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR939445A (en) |
-
1946
- 1946-12-20 FR FR939445D patent/FR939445A/en not_active Expired
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