NL36982C - - Google Patents
Info
- Publication number
- NL36982C NL36982C NL36982DA NL36982C NL 36982 C NL36982 C NL 36982C NL 36982D A NL36982D A NL 36982DA NL 36982 C NL36982 C NL 36982C
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1931S0100497 DE690711C (de) | 1931-08-20 | 1931-08-20 | Schaltungsanordnung fuer Fernsprechanlagen, in denen zur Signalgabe Wechselstroeme bestimmter Frequenzen innerhalb des Sprachfrequenzbereiches benutzt werden |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL36982C true NL36982C (pl) |
Family
ID=7523110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL36982D NL36982C (pl) | 1931-08-20 |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE690711C (pl) |
| NL (1) | NL36982C (pl) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE960737C (de) * | 1951-02-24 | 1957-04-18 | Siemens Ag | Schaltungsanordnung fuer Fernsprechanlagen, in denen zur Signalgabe Wechselstroeme innerhalb des Sprachbandes benutzt werden |
| DE1001709B (de) * | 1953-02-24 | 1957-01-31 | Int Standard Electric Corp | Tonfrequenzsignalempfaenger fuer zwei Frequenzen |
-
0
- NL NL36982D patent/NL36982C/xx active
-
1931
- 1931-08-20 DE DE1931S0100497 patent/DE690711C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE690711C (de) | 1940-05-04 |