NL30427C - - Google Patents
Info
- Publication number
- NL30427C NL30427C NL46833A NL46833A NL30427C NL 30427 C NL30427 C NL 30427C NL 46833 A NL46833 A NL 46833A NL 46833 A NL46833 A NL 46833A NL 30427 C NL30427 C NL 30427C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
-
- 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
- H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Transmission Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14539/29A GB334839A (en) | 1929-05-09 | 1929-05-09 | Improvements in automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL30427C true NL30427C (en:Method) | 1933-08-15 |
Family
ID=10043019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL46833A NL30427C (en:Method) | 1929-05-09 | 1929-06-19 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US1800240A (en:Method) |
| BE (1) | BE361512A (en:Method) |
| CH (1) | CH133058A (en:Method) |
| DE (1) | DE583032C (en:Method) |
| FR (1) | FR674620A (en:Method) |
| GB (1) | GB334839A (en:Method) |
| NL (1) | NL30427C (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2782257A (en) * | 1951-07-23 | 1957-02-19 | North Electric Co | Automatic telephone system |
-
1928
- 1928-08-04 DE DEZ17749D patent/DE583032C/de not_active Expired
- 1928-08-20 CH CH133058D patent/CH133058A/de unknown
-
1929
- 1929-05-06 FR FR674620D patent/FR674620A/fr not_active Expired
- 1929-05-09 GB GB14539/29A patent/GB334839A/en not_active Expired
- 1929-06-04 US US36831429 patent/US1800240A/en not_active Expired - Lifetime
- 1929-06-14 BE BE361512D patent/BE361512A/xx unknown
- 1929-06-19 NL NL46833A patent/NL30427C/xx active
Also Published As
| Publication number | Publication date |
|---|---|
| FR674620A (fr) | 1930-01-30 |
| DE583032C (de) | 1933-08-26 |
| BE361512A (en:Method) | 1929-10-31 |
| CH133058A (de) | 1929-05-15 |
| GB334839A (en) | 1930-09-09 |
| US1800240A (en) | 1931-04-14 |