FR647720A - - Google Patents
Info
- Publication number
- FR647720A FR647720A FR647720DA FR647720A FR 647720 A FR647720 A FR 647720A FR 647720D A FR647720D A FR 647720DA FR 647720 A FR647720 A FR 647720A
- 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
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR647720A true FR647720A (de) | 1928-11-30 |
Family
ID=1542829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR647720D Expired FR647720A (de) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR647720A (de) |
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0
- FR FR647720D patent/FR647720A/fr not_active Expired