NL146297B - PROJECTION DEVICE. - Google Patents

PROJECTION DEVICE.

Info

Publication number: NL146297B
Authority: NL; Netherlands
Prior art keywords: projection device; projection
Prior art date: 1971-02-15

Application number

NL717101975A

Other languages

Dutch (nl)

Other versions

NL7101975A (en

Original Assignee

Matsushita Electric Industrial Co Ltd

Priority date (The priority date 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 date listed.)

1971-02-15

Filing date

1971-02-15

Publication date

1975-06-16

1971-02-15 Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd

1971-02-15 Priority to NL717101975A priority Critical patent/NL146297B/en

1972-08-17 Publication of NL7101975A publication Critical patent/NL7101975A/xx

1975-06-16 Publication of NL146297B publication Critical patent/NL146297B/en

Classifications

- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B7/00—Electrically-operated teaching apparatus or devices working with questions and answers
- G09B7/06—Electrically-operated teaching apparatus or devices working with questions and answers of the multiple-choice answer-type, i.e. where a given question is provided with a series of answers and a choice has to be made from the answers
- 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

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Theoretical Computer Science (AREA)
Business, Economics & Management (AREA)
Educational Administration (AREA)
Educational Technology (AREA)

NL717101975A 1971-02-15 1971-02-15 PROJECTION DEVICE. NL146297B (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
NL717101975A NL146297B (en)	1971-02-15	1971-02-15	PROJECTION DEVICE.

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
NL717101975A NL146297B (en)	1971-02-15	1971-02-15	PROJECTION DEVICE.

Publications (2)

Publication Number	Publication Date
NL7101975A NL7101975A (en)	1972-08-17
NL146297B true NL146297B (en)	1975-06-16

Family

ID=19812482

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL717101975A NL146297B (en)	1971-02-15	1971-02-15	PROJECTION DEVICE.

Country Status (1)

Country	Link
NL (1)	NL146297B (en)

1971
- 1971-02-15 NL NL717101975A patent/NL146297B/en not_active IP Right Cessation

Also Published As

Publication number	Publication date
NL7101975A (en)	1972-08-17

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Legal Events

Date	Code	Title	Description
1984-06-18	V1	Lapsed because of non-payment of the annual fee
1991-02-28	NL80	Information provided on patent owner name for an already discontinued patent	Owner name: MATSUSHITA