BE814924A - DAY-TO-DAY PROJECTION DEVICE - Google Patents
DAY-TO-DAY PROJECTION DEVICEInfo
- Publication number
- BE814924A BE814924A BE144230A BE144230A BE814924A BE 814924 A BE814924 A BE 814924A BE 144230 A BE144230 A BE 144230A BE 144230 A BE144230 A BE 144230A BE 814924 A BE814924 A BE 814924A
- Authority
- BE
- Belgium
- Prior art keywords
- day
- projection device
- projection
- day projection
- 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
-
- 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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19737323841U DE7323841U (en) | 1973-06-23 | 1973-06-23 | DAYLIGHT PROJECTION DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
BE814924A true BE814924A (en) | 1974-09-02 |
Family
ID=6639341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE144230A BE814924A (en) | 1973-06-23 | 1974-05-13 | DAY-TO-DAY PROJECTION DEVICE |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE814924A (en) |
CH (1) | CH566020A5 (en) |
DE (1) | DE7323841U (en) |
DK (1) | DK333674A (en) |
FR (1) | FR2234828A5 (en) |
GB (1) | GB1421095A (en) |
NO (1) | NO741871L (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7628047U1 (en) * | 1976-09-08 | 1976-12-30 | Rollei-Werke Franke & Heidecke, 3300 Braunschweig | STILL PROJECTOR |
US5301094A (en) * | 1993-03-17 | 1994-04-05 | Minnesota Mining And Manufacturing Company | Lamp changing assembly for overhead projector |
-
1973
- 1973-06-23 DE DE19737323841U patent/DE7323841U/en not_active Expired
- 1973-12-14 FR FR7344734A patent/FR2234828A5/fr not_active Expired
-
1974
- 1974-04-29 CH CH586374A patent/CH566020A5/xx not_active IP Right Cessation
- 1974-05-13 BE BE144230A patent/BE814924A/en unknown
- 1974-05-14 GB GB2127974A patent/GB1421095A/en not_active Expired
- 1974-05-22 NO NO741871A patent/NO741871L/no unknown
- 1974-06-21 DK DK333674A patent/DK333674A/da unknown
Also Published As
Publication number | Publication date |
---|---|
CH566020A5 (en) | 1975-08-29 |
FR2234828A5 (en) | 1975-01-17 |
DE7323841U (en) | 1973-11-22 |
GB1421095A (en) | 1976-01-14 |
DK333674A (en) | 1975-02-10 |
NO741871L (en) | 1975-01-20 |
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