NL52577C - - Google Patents
Info
- Publication number
- NL52577C NL52577C NL89626A NL89626A NL52577C NL 52577 C NL52577 C NL 52577C NL 89626 A NL89626 A NL 89626A NL 89626 A NL89626 A NL 89626A NL 52577 C NL52577 C NL 52577C
- Authority
- NL
- Netherlands
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
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- 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
- H04B1/44—Transmit/receive switching
- H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1937S0128684 DE694606C (de) | 1937-09-08 | 1937-09-08 | Schaltungsanordnung zur Ausuebung einer Steuerwirkung in Abhaengigkeit von zwei durch die Sprechstroeme der beiden Gespraechsrichtungen hervorgerufenen Spannungen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL52577C true NL52577C (it) | 1942-06-15 |
Family
ID=7537885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL89626A NL52577C (it) | 1937-09-08 | 1938-09-07 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2229806A (it) |
| CH (2) | CH206313A (it) |
| DE (1) | DE694606C (it) |
| FR (2) | FR843122A (it) |
| NL (1) | NL52577C (it) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE759529C (de) * | 1940-04-26 | 1954-05-03 | Hell Rudolf Dr Ing | Rueckkopplungssperre |
| US2615997A (en) * | 1946-12-13 | 1952-10-28 | Kellogg Switchboard & Supply | Telephone repeater |
| DE925833C (de) * | 1950-12-19 | 1955-03-31 | Normalzeit G M B H | Schaltungsanordnung fuer Gegensprechanlagen |
| US3250988A (en) * | 1960-12-06 | 1966-05-10 | Western Electric Co | Testing apparatus for determining the operate and release currents of relays |
-
1937
- 1937-09-08 DE DE1937S0128684 patent/DE694606C/de not_active Expired
-
1938
- 1938-08-31 US US227648A patent/US2229806A/en not_active Expired - Lifetime
- 1938-09-05 CH CH206313D patent/CH206313A/de unknown
- 1938-09-06 FR FR843122D patent/FR843122A/fr not_active Expired
- 1938-09-07 NL NL89626A patent/NL52577C/xx active
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1940
- 1940-12-19 CH CH219592D patent/CH219592A/de unknown
- 1940-12-24 FR FR51277D patent/FR51277E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH206313A (de) | 1939-07-31 |
| DE694606C (de) | 1940-08-05 |
| US2229806A (en) | 1941-01-28 |
| FR51277E (fr) | 1942-02-18 |
| CH219592A (de) | 1942-02-15 |
| FR843122A (fr) | 1939-06-26 |