NL7014841A - - Google Patents
Info
- Publication number
- NL7014841A NL7014841A NL7014841A NL7014841A NL7014841A NL 7014841 A NL7014841 A NL 7014841A NL 7014841 A NL7014841 A NL 7014841A NL 7014841 A NL7014841 A NL 7014841A NL 7014841 A NL7014841 A NL 7014841A
- Authority
- NL
- Netherlands
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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP44081421A JPS4814691B1 (de) | 1969-10-11 | 1969-10-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NL7014841A true NL7014841A (de) | 1971-04-14 |
| NL149018B 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 (de) |
| JP (1) | JPS4814691B1 (de) |
| CA (1) | CA934150A (de) |
| DE (1) | DE2049713C3 (de) |
| GB (1) | GB1322059A (de) |
| NL (1) | NL149018B (de) |
Family Cites Families (2)
| 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 |
| NL149018B (nl) | 1976-03-15 |
| DE2049713B2 (de) | 1974-02-28 |
| GB1322059A (en) | 1973-07-04 |
| JPS4814691B1 (de) | 1973-05-09 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| V1 | Lapsed because of non-payment of the annual fee | ||
| NL80 | Abbreviated name of patent owner mentioned of already nullified patent |
Owner name: MATSUSHITA |