CH513423A - Schreibprojektor - Google Patents
SchreibprojektorInfo
- Publication number
- CH513423A CH513423A CH246771A CH246771A CH513423A CH 513423 A CH513423 A CH 513423A CH 246771 A CH246771 A CH 246771A CH 246771 A CH246771 A CH 246771A CH 513423 A CH513423 A CH 513423A
- Authority
- CH
- Switzerland
- Prior art keywords
- writing projector
- projector
- writing
- Prior art date
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 (de) | 1970-04-09 | 1970-04-09 | Schreibprojektor. |
Publications (1)
Publication Number | Publication Date |
---|---|
CH513423A true CH513423A (de) | 1971-09-30 |
Family
ID=6610881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH246771A CH513423A (de) | 1970-04-09 | 1971-02-19 | Schreibprojektor |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH513423A (de) |
DE (1) | DE7013649U (de) |
DK (1) | DK125937B (de) |
FR (1) | FR2083220A5 (de) |
SE (1) | SE371504B (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991000546A1 (en) * | 1987-12-30 | 1991-01-10 | Educatek Oy | Overhead projector |
-
1970
- 1970-04-09 DE DE19707013649 patent/DE7013649U/de not_active Expired
-
1971
- 1971-02-19 CH CH246771A patent/CH513423A/de unknown
- 1971-03-19 FR FR7109695A patent/FR2083220A5/fr not_active Expired
- 1971-04-06 DK DK163271A patent/DK125937B/da unknown
- 1971-04-13 SE SE474871A patent/SE371504B/xx unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991000546A1 (en) * | 1987-12-30 | 1991-01-10 | Educatek Oy | Overhead projector |
US5214459A (en) * | 1987-12-30 | 1993-05-25 | Educatek Oy | Overhead projectors |
Also Published As
Publication number | Publication date |
---|---|
DK125937B (da) | 1973-05-21 |
FR2083220A5 (de) | 1971-12-10 |
DE7013649U (de) | 1970-08-20 |
SE371504B (de) | 1974-11-18 |
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