FR75257E - - Google Patents
Info
- Publication number
- FR75257E FR75257E FR75257DA FR75257E FR 75257 E FR75257 E FR 75257E FR 75257D A FR75257D A FR 75257DA FR 75257 E FR75257 E FR 75257E
- 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
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
- G07C1/20—Checking timed patrols, e.g. of watchman
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR739505A FR1249221A (en) | 1957-05-27 | 1957-05-27 | Improvements to alternative switching telecommunication systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR75257E true FR75257E (en) | 1961-10-04 |
Family
ID=8704435
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR75257D Expired FR75257E (en) | 1957-05-27 | ||
| FR739505A Expired FR1249221A (en) | 1957-05-27 | 1957-05-27 | Improvements to alternative switching telecommunication systems |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR739505A Expired FR1249221A (en) | 1957-05-27 | 1957-05-27 | Improvements to alternative switching telecommunication systems |
Country Status (1)
| Country | Link |
|---|---|
| FR (2) | FR1249221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069742A (en) * | 1995-06-01 | 2000-05-30 | Joshua David Silver | Optical apparatus and method |
-
0
- FR FR75257D patent/FR75257E/fr not_active Expired
-
1957
- 1957-05-27 FR FR739505A patent/FR1249221A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069742A (en) * | 1995-06-01 | 2000-05-30 | Joshua David Silver | Optical apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1249221A (en) | 1960-12-30 |