NL149018B - Projectiestelsel voor leerdoeleinden. - Google Patents

Projectiestelsel voor leerdoeleinden.

Info

Publication number: NL149018B
Authority: NL; Netherlands
Prior art keywords: projection scheme; learning purposes; learning; purposes; projection
Prior art date: 1969-10-11

Application number

NL707014841A

Other languages

English (en)

Dutch (nl)

Other versions

NL7014841A (xx

Original Assignee

Matsushita Electric Ind 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.)

1969-10-11

Filing date

1970-10-09

Publication date

1976-03-15

1970-10-09 Application filed by Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd

1971-04-14 Publication of NL7014841A publication Critical patent/NL7014841A/xx

1976-03-15 Publication of NL149018B publication Critical patent/NL149018B/xx

Links

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

Landscapes

Engineering & Computer Science (AREA)
Theoretical Computer Science (AREA)
Business, Economics & Management (AREA)
Physics & Mathematics (AREA)
Educational Administration (AREA)
Educational Technology (AREA)
General Physics & Mathematics (AREA)
Electrically Operated Instructional Devices (AREA)
Projection Apparatus (AREA)
Overhead Projectors And Projection Screens (AREA)

NL707014841A 1969-10-11 1970-10-09 Projectiestelsel voor leerdoeleinden. NL149018B (nl)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
JP44081421A JPS4814691B1 (xx)	1969-10-11	1969-10-11

Publications (2)

Publication Number	Publication Date
NL7014841A NL7014841A (xx)	1971-04-14
NL149018B true NL149018B (nl)	1976-03-15

Family

ID=13745876

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL707014841A NL149018B (nl)	1969-10-11	1970-10-09	Projectiestelsel voor leerdoeleinden.

Country Status (6)

Country	Link
US (1)	US3701204A (xx)
JP (1)	JPS4814691B1 (xx)
CA (1)	CA934150A (xx)
DE (1)	DE2049713C3 (xx)
GB (1)	GB1322059A (xx)
NL (1)	NL149018B (xx)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US23030A (en) *		1859-02-22		Improvement in steam-boilers
US2783454A (en) *	1955-01-12	1957-02-26	Donald O North	Data assembly apparatus

1969
- 1969-10-11 JP JP44081421A patent/JPS4814691B1/ja active Pending
1970
- 1970-10-09 US US79565A patent/US3701204A/en not_active Expired - Lifetime
- 1970-10-09 DE DE2049713A patent/DE2049713C3/de not_active Expired
- 1970-10-09 NL NL707014841A patent/NL149018B/xx not_active IP Right Cessation
- 1970-10-09 CA CA095253A patent/CA934150A/en not_active Expired
- 1970-10-12 GB GB4845170A patent/GB1322059A/en not_active Expired

Also Published As

Publication number	Publication date
DE2049713C3 (de)	1974-09-26
DE2049713A1 (de)	1971-05-13
CA934150A (en)	1973-09-25
US3701204A (en)	1972-10-31
NL7014841A (xx)	1971-04-14
DE2049713B2 (de)	1974-02-28
GB1322059A (en)	1973-07-04
JPS4814691B1 (xx)	1973-05-09

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Legal Events

Date	Code	Title	Description
1985-03-18	V1	Lapsed because of non-payment of the annual fee
1990-10-31	NL80	Abbreviated name of patent owner mentioned of already nullified patent	Owner name: MATSUSHITA