FR556523A - - Google Patents
Info
- Publication number
- FR556523A FR556523A FR556523DA FR556523A FR 556523 A FR556523 A FR 556523A FR 556523D A FR556523D A FR 556523DA FR 556523 A FR556523 A FR 556523A
- 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
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2560421A GB190793A (en) | 1921-09-27 | 1921-09-27 | Improvements in connection with telephonic systems, or apparatus, more especially intended for use in mines, and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR556523A true FR556523A (de) | 1923-07-21 |
Family
ID=10230373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR556523D Expired FR556523A (de) | 1921-09-27 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR556523A (de) |
| GB (1) | GB190793A (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4960393A (en) * | 1988-01-21 | 1990-10-02 | Kurt Stoll | Plug connecting device for electrical equipment |
-
0
- FR FR556523D patent/FR556523A/fr not_active Expired
-
1921
- 1921-09-27 GB GB2560421A patent/GB190793A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4960393A (en) * | 1988-01-21 | 1990-10-02 | Kurt Stoll | Plug connecting device for electrical equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB190793A (en) | 1922-12-27 |