FR741529A - - Google Patents
Info
- Publication number
- FR741529A FR741529A FR741529DA FR741529A FR 741529 A FR741529 A FR 741529A FR 741529D A FR741529D A FR 741529DA FR 741529 A FR741529 A FR 741529A
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Publications (1)
Publication Number | Publication Date |
---|---|
FR741529A true FR741529A (zh) | 1933-02-10 |
Family
ID=1546056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR741529D Expired FR741529A (zh) |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR741529A (zh) |
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0
- FR FR741529D patent/FR741529A/fr not_active Expired