FR670973A - Improvements to cinematographic screens - Google Patents
Improvements to cinematographic screensInfo
- Publication number
- FR670973A FR670973A FR670973DA FR670973A FR 670973 A FR670973 A FR 670973A FR 670973D A FR670973D A FR 670973DA FR 670973 A FR670973 A FR 670973A
- Authority
- FR
- France
- Prior art keywords
- cinematographic
- screens
- cinematographic screens
- 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
-
- 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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/565—Screens allowing free passage of sound
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR670973T | 1929-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR670973A true FR670973A (en) | 1929-12-06 |
Family
ID=9016712
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR670973D Expired FR670973A (en) | 1929-03-06 | 1929-03-06 | Improvements to cinematographic screens |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR670973A (en) |
-
1929
- 1929-03-06 FR FR670973D patent/FR670973A/en not_active Expired
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