FR647442A - Automatic call device for domestic telephone installations - Google Patents
Automatic call device for domestic telephone installationsInfo
- Publication number
- FR647442A FR647442A FR647442DA FR647442A FR 647442 A FR647442 A FR 647442A FR 647442D A FR647442D A FR 647442DA FR 647442 A FR647442 A FR 647442A
- Authority
- FR
- France
- Prior art keywords
- call device
- automatic call
- domestic telephone
- telephone installations
- installations
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB16228A GB290937A (en) | 1928-01-03 | 1928-01-03 | Improvements in or relating to electric telephone installations |
Publications (1)
Publication Number | Publication Date |
---|---|
FR647442A true FR647442A (en) | 1928-11-23 |
Family
ID=9699489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR647442D Expired FR647442A (en) | 1928-01-03 | 1928-01-18 | Automatic call device for domestic telephone installations |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR647442A (en) |
GB (1) | GB290937A (en) |
-
1928
- 1928-01-03 GB GB16228A patent/GB290937A/en not_active Expired
- 1928-01-18 FR FR647442D patent/FR647442A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB290937A (en) | 1928-05-24 |
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