NL21888C - - Google Patents
Info
- Publication number
- NL21888C NL21888C NL21888DA NL21888C NL 21888 C NL21888 C NL 21888C NL 21888D A NL21888D A NL 21888DA NL 21888 C NL21888 C NL 21888C
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE633325X | 1926-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL21888C true NL21888C (sv) |
Family
ID=6579115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL21888D NL21888C (sv) | 1926-04-29 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR633325A (sv) |
| NL (1) | NL21888C (sv) |
-
0
- NL NL21888D patent/NL21888C/xx active
-
1927
- 1927-04-26 FR FR633325D patent/FR633325A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR633325A (fr) | 1928-01-27 |