FR639277A - Improvements in light signals - Google Patents
Improvements in light signalsInfo
- Publication number
- FR639277A FR639277A FR639277DA FR639277A FR 639277 A FR639277 A FR 639277A FR 639277D A FR639277D A FR 639277DA FR 639277 A FR639277 A FR 639277A
- Authority
- FR
- France
- Prior art keywords
- light signals
- signals
- light
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1845—Optical systems, lenses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US639277XA | 1926-10-27 | 1926-10-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR639277A true FR639277A (en) | 1928-06-18 |
Family
ID=22052415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR639277D Expired FR639277A (en) | 1926-10-27 | 1927-08-10 | Improvements in light signals |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR639277A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953961A (en) * | 1957-02-01 | 1960-09-27 | Gen Motors Corp | Rear vision means |
US4269168A (en) * | 1978-12-18 | 1981-05-26 | Johnson Steven A | Focusing reflector solar energy collector apparatus and method |
US4284839A (en) * | 1978-12-18 | 1981-08-18 | Johnson Steven A | Internal refractor focusing solar energy collector apparatus and method |
US4297521A (en) * | 1978-12-18 | 1981-10-27 | Johnson Steven A | Focusing cover solar energy collector apparatus |
-
1927
- 1927-08-10 FR FR639277D patent/FR639277A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953961A (en) * | 1957-02-01 | 1960-09-27 | Gen Motors Corp | Rear vision means |
US4269168A (en) * | 1978-12-18 | 1981-05-26 | Johnson Steven A | Focusing reflector solar energy collector apparatus and method |
US4284839A (en) * | 1978-12-18 | 1981-08-18 | Johnson Steven A | Internal refractor focusing solar energy collector apparatus and method |
US4297521A (en) * | 1978-12-18 | 1981-10-27 | Johnson Steven A | Focusing cover solar energy collector apparatus |
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