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Patent:US3412470
| Patent: | US 3412470 |
| Title: | Educational Device |
| Date: | 26.11.1968 |
| Place: | |
| Country: | USA |
| Person: | R. C. Williams et al. |
| Company: | |
| Internal Links: | Lehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US3412470 (espacenet), US3412470 (uspto) |
Aus der Patentschrift US3412470
- DATUM: 26.11.1968
- TITEL: Educational device
- PERSON: ROLAND J MACCI