FR667117A - Improvements to telephone systems - Google Patents
Improvements to telephone systemsInfo
- Publication number
- FR667117A FR667117A FR667117DA FR667117A FR 667117 A FR667117 A FR 667117A FR 667117D A FR667117D A FR 667117DA FR 667117 A FR667117 A FR 667117A
- Authority
- FR
- France
- Prior art keywords
- telephone systems
- telephone
- systems
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Relay Circuits (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Exchange Systems With Centralized Control (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US283201XA | 1927-01-07 | 1927-01-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR667117A true FR667117A (en) | 1929-10-12 |
Family
ID=21842786
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR667117D Expired FR667117A (en) | 1927-01-07 | 1927-12-15 | Improvements to telephone systems |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH136195A (en) |
FR (1) | FR667117A (en) |
GB (3) | GB294618A (en) |
-
1927
- 1927-12-14 GB GB21867/28D patent/GB294618A/en not_active Expired
- 1927-12-14 GB GB2535/29A patent/GB304702A/en not_active Expired
- 1927-12-14 GB GB33906/27A patent/GB283201A/en not_active Expired
- 1927-12-15 FR FR667117D patent/FR667117A/en not_active Expired
-
1928
- 1928-01-03 CH CH136195D patent/CH136195A/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB283201A (en) | 1929-03-14 |
CH136195A (en) | 1929-10-31 |
GB304702A (en) | 1929-03-14 |
GB294618A (en) | 1929-03-14 |
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