BE731374A - - Google Patents
Info
- Publication number
- BE731374A BE731374A BE731374DA BE731374A BE 731374 A BE731374 A BE 731374A BE 731374D A BE731374D A BE 731374DA BE 731374 A BE731374 A BE 731374A
- Authority
- BE
- Belgium
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
- G09B5/00—Electrically-operated educational appliances
- G09B5/04—Electrically-operated educational appliances with audible presentation of the material to be studied
Landscapes
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electrically Operated Instructional Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE731374 | 1969-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE731374A true BE731374A (zh) | 1969-10-13 |
Family
ID=3854588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE731374D BE731374A (zh) | 1969-04-11 | 1969-04-11 |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE731374A (zh) |
| GB (1) | GB1256213A (zh) |
-
1969
- 1969-04-11 BE BE731374D patent/BE731374A/xx unknown
-
1970
- 1970-04-07 GB GB1640070A patent/GB1256213A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1256213A (en) | 1971-12-08 |