JPS4814691B1 - - Google Patents
Info
- Publication number
- JPS4814691B1 JPS4814691B1 JP44081421A JP8142169A JPS4814691B1 JP S4814691 B1 JPS4814691 B1 JP S4814691B1 JP 44081421 A JP44081421 A JP 44081421A JP 8142169 A JP8142169 A JP 8142169A JP S4814691 B1 JPS4814691 B1 JP S4814691B1
- Authority
- JP
- Japan
- Legal status (The legal status 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 status listed.)
- Pending
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)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP44081421A JPS4814691B1 (ja) | 1969-10-11 | 1969-10-11 | |
| CA095253A CA934150A (en) | 1969-10-11 | 1970-10-09 | Projector |
| NL707014841A NL149018B (nl) | 1969-10-11 | 1970-10-09 | Projectiestelsel voor leerdoeleinden. |
| US79565A US3701204A (en) | 1969-10-11 | 1970-10-09 | Educational projector having movable shutters |
| DE2049713A DE2049713C3 (de) | 1969-10-11 | 1970-10-09 | Lehrprojektor |
| GB4845170A GB1322059A (en) | 1969-10-11 | 1970-10-12 | Teaching apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP44081421A JPS4814691B1 (ja) | 1969-10-11 | 1969-10-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS4814691B1 true JPS4814691B1 (ja) | 1973-05-09 |
Family
ID=13745876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP44081421A Pending JPS4814691B1 (ja) | 1969-10-11 | 1969-10-11 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3701204A (ja) |
| JP (1) | JPS4814691B1 (ja) |
| CA (1) | CA934150A (ja) |
| DE (1) | DE2049713C3 (ja) |
| GB (1) | GB1322059A (ja) |
| NL (1) | NL149018B (ja) |
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 DE DE2049713A patent/DE2049713C3/de not_active Expired
- 1970-10-09 US US79565A patent/US3701204A/en not_active Expired - Lifetime
- 1970-10-09 CA CA095253A patent/CA934150A/en not_active Expired
- 1970-10-09 NL NL707014841A patent/NL149018B/xx not_active IP Right Cessation
- 1970-10-12 GB GB4845170A patent/GB1322059A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2049713A1 (de) | 1971-05-13 |
| US3701204A (en) | 1972-10-31 |
| NL7014841A (ja) | 1971-04-14 |
| CA934150A (en) | 1973-09-25 |
| DE2049713C3 (de) | 1974-09-26 |
| DE2049713B2 (de) | 1974-02-28 |
| NL149018B (nl) | 1976-03-15 |
| GB1322059A (en) | 1973-07-04 |