FR672257A - - Google Patents
Info
- Publication number
- FR672257A FR672257A FR672257DA FR672257A FR 672257 A FR672257 A FR 672257A FR 672257D A FR672257D A FR 672257DA FR 672257 A FR672257 A FR 672257A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/16—Arrangements for interconnection between switching centres in systems employing carrier frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US308796XA | 1928-03-30 | 1928-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR672257A true FR672257A (xx) | 1929-12-31 |
Family
ID=21856487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR672257D Expired FR672257A (xx) | 1928-03-30 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR672257A (xx) |
| GB (1) | GB308796A (xx) |
-
0
- FR FR672257D patent/FR672257A/fr not_active Expired
-
1929
- 1929-03-18 GB GB8713/29A patent/GB308796A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB308796A (en) | 1930-06-18 |