NL49979C - - Google Patents
Info
- Publication number
- NL49979C NL49979C NL49979DA NL49979C NL 49979 C NL49979 C NL 49979C NL 49979D A NL49979D A NL 49979DA NL 49979 C NL49979 C NL 49979C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US113820A US2117843A (en) | 1936-12-02 | 1936-12-02 | Frequency selective circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL49979C true NL49979C (da) |
Family
ID=22351700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL49979D NL49979C (da) | 1936-12-02 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2117843A (da) |
| BE (1) | BE424937A (da) |
| CH (1) | CH211212A (da) |
| FR (1) | FR830249A (da) |
| NL (1) | NL49979C (da) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2694163A (en) * | 1951-03-16 | 1954-11-09 | Joseph G Sola | Voltage sensitive apparatus |
| US2801290A (en) * | 1951-09-17 | 1957-07-30 | Telefunken Gmbh | Calling signal responder arrangements |
-
0
- NL NL49979D patent/NL49979C/xx active
- BE BE424937D patent/BE424937A/xx unknown
-
1936
- 1936-12-02 US US113820A patent/US2117843A/en not_active Expired - Lifetime
-
1937
- 1937-12-01 FR FR830249D patent/FR830249A/fr not_active Expired
- 1937-12-02 CH CH211212D patent/CH211212A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US2117843A (en) | 1938-05-17 |
| FR830249A (fr) | 1938-07-25 |
| BE424937A (da) | |
| CH211212A (de) | 1940-08-31 |