FR667328A - Improvements to automatic telephone systems - Google Patents
Improvements to automatic telephone systemsInfo
- Publication number
- FR667328A FR667328A FR667328DA FR667328A FR 667328 A FR667328 A FR 667328A FR 667328D A FR667328D A FR 667328DA FR 667328 A FR667328 A FR 667328A
- Authority
- FR
- France
- Prior art keywords
- telephone systems
- automatic telephone
- automatic
- systems
- telephone
- Prior art date
- 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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR39921T | 1930-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR667328A true FR667328A (en) | 1929-10-15 |
Family
ID=8676256
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR667328D Expired FR667328A (en) | 1930-06-20 | 1928-03-27 | Improvements to automatic telephone systems |
FR39921D Expired FR39921E (en) | 1930-06-20 | 1930-06-20 | Further training in automatic telephone systems |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR39921D Expired FR39921E (en) | 1930-06-20 | 1930-06-20 | Further training in automatic telephone systems |
Country Status (1)
Country | Link |
---|---|
FR (2) | FR667328A (en) |
-
1928
- 1928-03-27 FR FR667328D patent/FR667328A/en not_active Expired
-
1930
- 1930-06-20 FR FR39921D patent/FR39921E/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR39921E (en) | 1932-03-19 |
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