BE706791A - - Google Patents
Info
- Publication number
- BE706791A BE706791A BE706791DA BE706791A BE 706791 A BE706791 A BE 706791A BE 706791D A BE706791D A BE 706791DA BE 706791 A BE706791 A BE 706791A
- Authority
- BE
- Belgium
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
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Transforming Electric Information Into Light Information (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59567666A | 1966-11-21 | 1966-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE706791A true BE706791A (de) | 1968-04-01 |
Family
ID=24384208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE706791D BE706791A (de) | 1966-11-21 | 1967-11-20 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3469899A (de) |
| BE (1) | BE706791A (de) |
| CH (1) | CH474082A (de) |
| DE (1) | DE1572654B1 (de) |
| GB (1) | GB1214304A (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114640833B (zh) * | 2022-03-11 | 2024-07-02 | 峰米(重庆)创新科技有限公司 | 投影画面调整方法、装置、电子设备和存储介质 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US536790A (en) * | 1895-04-02 | Flash-light apparatus | ||
| US2867045A (en) * | 1956-09-06 | 1959-01-06 | Irvine H Millgate | Visual instruction aids |
| US3205772A (en) * | 1961-11-16 | 1965-09-14 | Radiant Mfg Corp | Keystone eliminator for portable projection screens |
-
1966
- 1966-11-21 US US595676A patent/US3469899A/en not_active Expired - Lifetime
-
1967
- 1967-11-17 GB GB52361/67A patent/GB1214304A/en not_active Expired
- 1967-11-20 BE BE706791D patent/BE706791A/xx unknown
- 1967-11-20 DE DE19671572654 patent/DE1572654B1/de active Pending
- 1967-11-21 CH CH1626067A patent/CH474082A/fr not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| US3469899A (en) | 1969-09-30 |
| CH474082A (fr) | 1969-06-15 |
| GB1214304A (en) | 1970-12-02 |
| DE1572654B1 (de) | 1970-06-25 |