Patent:US4416633
Patent: | US 4416633 |
Titel: | Educational and recreational mathematical device in the form of a band, |
Datum: | 22.11.1983 |
Ort: | 880 Fifth Ave., New York, NY 10021 |
Land: | USA |
Person: | Gulack, Max A. |
Firma: | |
Links im Rechnerlexikon: | Lehrmittel |
Schlagworte: | |
Link zum Patentamt: (ohne Garantie) | US4416633 (espacenet), US4416633 (uspto) |
- DATUM: 22.11.1983
- TITEL: Educational and recreational mathematical device in the form of a band, ring or concentric rings
- PERSON: GULACK MAX A