FR2197475A7 - - Google Patents
Info
- Publication number
- FR2197475A7 FR2197475A7 FR7330129A FR7330129A FR2197475A7 FR 2197475 A7 FR2197475 A7 FR 2197475A7 FR 7330129 A FR7330129 A FR 7330129A FR 7330129 A FR7330129 A FR 7330129A FR 2197475 A7 FR2197475 A7 FR 2197475A7
- 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
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19727231583 DE7231583U (en) | 1972-08-23 | 1972-08-23 | WRITING PROJECTOR |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2197475A7 true FR2197475A7 (en) | 1974-03-22 |
Family
ID=6632317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7330129A Expired FR2197475A7 (en) | 1972-08-23 | 1973-08-20 |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE7231583U (en) |
FR (1) | FR2197475A7 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0197691A1 (en) * | 1985-04-01 | 1986-10-15 | Minnesota Mining And Manufacturing Company | Automatic focus for overhead projector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK24283A (en) * | 1983-01-21 | 1984-07-22 | Memofax As | OVERHEAD PROJECTOR |
-
1972
- 1972-08-23 DE DE19727231583 patent/DE7231583U/en not_active Expired
-
1973
- 1973-08-20 FR FR7330129A patent/FR2197475A7/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0197691A1 (en) * | 1985-04-01 | 1986-10-15 | Minnesota Mining And Manufacturing Company | Automatic focus for overhead projector |
Also Published As
Publication number | Publication date |
---|---|
DE7231583U (en) | 1973-01-04 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |