FR677622A - Improvements to projectors including incandescent electric lamps - Google Patents
Improvements to projectors including incandescent electric lampsInfo
- Publication number
- FR677622A FR677622A FR677622DA FR677622A FR 677622 A FR677622 A FR 677622A FR 677622D A FR677622D A FR 677622DA FR 677622 A FR677622 A FR 677622A
- Authority
- FR
- France
- Prior art keywords
- electric lamps
- incandescent electric
- including incandescent
- projectors including
- projectors
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
- F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE677622X | 1928-06-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR677622A true FR677622A (en) | 1930-03-12 |
Family
ID=3877650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR677622D Expired FR677622A (en) | 1928-06-30 | 1929-06-29 | Improvements to projectors including incandescent electric lamps |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR677622A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2402830A1 (en) * | 1977-09-12 | 1979-04-06 | Sassmannshausen Knut | HEADLIGHT |
-
1929
- 1929-06-29 FR FR677622D patent/FR677622A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2402830A1 (en) * | 1977-09-12 | 1979-04-06 | Sassmannshausen Knut | HEADLIGHT |
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