Patent:US1719108
Brevetto: | US 1719108 |
Titolo: | Game for teaching multiplication |
Data: | 02.07.1929 |
Luogo: | |
Nazione: | Stati Uniti |
Persona: | Eleanor Fennell |
Ditta: | |
Link interni: | Lehrmittel, Multipliziertafel |
Keywords: | |
Link al brevetto: (without guarantee) | ![]() ![]() |
- DATUM: 02.07.1929
- TITEL: Game for teaching multiplication