Patent:GB359210
Patent: | GB 359210 |
Titel: | Improved apparatus for teaching calculations to children and for like |
Datum: | 22.10.1931 |
Ort: | |
Land: | Großbritannien |
Person: | Sarah Weaver Stephens |
Firma: | |
Links im Rechnerlexikon: | Lehrmittel, Kugelrechner |
Schlagworte: | |
Link zum Patentamt: (ohne Garantie) | GB359210 |
- DATUM: 22.10.1931
- TITEL: Improved apparatus for teaching calculations to children and for like purposes
- PERSON: SARAH WEAVER STEPHENS