Patent:US3136076
Patent: | US 3136076 |
Titel: | Educational Tool Adapted to Faciliate Teaching the Arithmetic of Fractions |
Datum: | 09.06.1964 |
Ort: | |
Land: | USA |
Person: | A. F. Schott |
Firma: | |
Links im Rechnerlexikon: | Lehrmittel |
Schlagworte: | |
Link zum Patentamt: (ohne Garantie) | US3136076 (espacenet), US3136076 (uspto) |
- DATUM: 09.06.1964
- TITEL: Educational tool adapted to facilitate teaching the arithmetic of fractions