NL16989C - - Google Patents
Info
- Publication number
- NL16989C NL16989C NL26751A NL26751A NL16989C NL 16989 C NL16989 C NL 16989C NL 26751 A NL26751 A NL 26751A NL 26751 A NL26751 A NL 26751A NL 16989 C NL16989 C NL 16989C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Dc Digital Transmission (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB765824A GB228387A (en) | 1924-03-26 | 1924-03-26 | Improvements in or in connection with telephonic repeating systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL16989C true NL16989C (xx) | 1927-10-15 |
Family
ID=9837325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL26751A NL16989C (xx) | 1924-03-26 | 1924-04-03 |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR580294A (xx) |
| GB (1) | GB228387A (xx) |
| NL (1) | NL16989C (xx) |
-
1924
- 1924-03-26 GB GB765824A patent/GB228387A/en not_active Expired
- 1924-04-03 NL NL26751A patent/NL16989C/xx active
- 1924-04-18 FR FR580294D patent/FR580294A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR580294A (fr) | 1924-11-04 |
| GB228387A (en) | 1925-02-05 |