FR620750A - - Google Patents
Info
- Publication number
- FR620750A FR620750A FR620750DA FR620750A FR 620750 A FR620750 A FR 620750A FR 620750D A FR620750D A FR 620750DA FR 620750 A FR620750 A FR 620750A
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
- B61L23/22—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in two directions over the same pair of rails
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR620750A true FR620750A (zh) | 1927-04-28 |
Family
ID=1541166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR620750D Expired FR620750A (zh) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR620750A (zh) |
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0
- FR FR620750D patent/FR620750A/fr not_active Expired