NL40819C - - Google Patents
Info
- Publication number
- NL40819C NL40819C NL40819DA NL40819C NL 40819 C NL40819 C NL 40819C NL 40819D A NL40819D A NL 40819DA NL 40819 C NL40819 C NL 40819C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Alarm Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE620251T | 1930-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL40819C true NL40819C (https=) |
Family
ID=34812903
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL40819D NL40819C (https=) | 1930-12-09 | ||
| NL39531D NL39531C (https=) | 1930-12-09 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL39531D NL39531C (https=) | 1930-12-09 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE620251C (https=) |
| FR (2) | FR727923A (https=) |
| NL (2) | NL39531C (https=) |
-
0
- NL NL40819D patent/NL40819C/xx active
- NL NL39531D patent/NL39531C/xx active
-
1930
- 1930-12-09 DE DE1930620251D patent/DE620251C/de not_active Expired
-
1931
- 1931-12-07 FR FR727923D patent/FR727923A/fr not_active Expired
-
1932
- 1932-12-12 FR FR42678D patent/FR42678E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR42678E (fr) | 1933-09-01 |
| FR727923A (fr) | 1932-06-27 |
| DE620251C (de) | 1935-10-17 |
| NL39531C (https=) |