SE371504B - - Google Patents
Info
- Publication number
- SE371504B SE371504B SE474871A SE474871A SE371504B SE 371504 B SE371504 B SE 371504B SE 474871 A SE474871 A SE 474871A SE 474871 A SE474871 A SE 474871A SE 371504 B SE371504 B SE 371504B
- Authority
- SE
- Sweden
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/02—Draughting machines or drawing devices for keeping parallelism
- B43L13/022—Draughting machines or drawing devices for keeping parallelism automatic
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Drawing Aids And Blackboards (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19707013649 DE7013649U (en) | 1970-04-09 | 1970-04-09 | WRITING PROJECTOR. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE371504B true SE371504B (en) | 1974-11-18 |
Family
ID=6610881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE474871A SE371504B (en) | 1970-04-09 | 1971-04-13 |
Country Status (5)
| Country | Link |
|---|---|
| CH (1) | CH513423A (en) |
| DE (1) | DE7013649U (en) |
| DK (1) | DK125937B (en) |
| FR (1) | FR2083220A5 (en) |
| SE (1) | SE371504B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5214459A (en) * | 1987-12-30 | 1993-05-25 | Educatek Oy | Overhead projectors |
-
1970
- 1970-04-09 DE DE19707013649 patent/DE7013649U/en not_active Expired
-
1971
- 1971-02-19 CH CH246771A patent/CH513423A/en unknown
- 1971-03-19 FR FR7109695A patent/FR2083220A5/fr not_active Expired
- 1971-04-06 DK DK163271A patent/DK125937B/en unknown
- 1971-04-13 SE SE474871A patent/SE371504B/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5214459A (en) * | 1987-12-30 | 1993-05-25 | Educatek Oy | Overhead projectors |
Also Published As
| Publication number | Publication date |
|---|---|
| DK125937B (en) | 1973-05-21 |
| FR2083220A5 (en) | 1971-12-10 |
| DE7013649U (en) | 1970-08-20 |
| CH513423A (en) | 1971-09-30 |