Patent:US4416633
Brevet: | US 4416633 |
Titre: | Educational and recreational mathematical device in the form of a band, |
Date: | 22.11.1983 |
Lieu: | 880 Fifth Ave., New York, NY 10021 |
Pays: | Ètats-Unis |
Personne: | Gulack, Max A. |
Entreprise: | |
Liens internes: | Lehrmittel |
Mots-Clefs: | |
Lien à la bureau des brevets: (sans garantie) | ![]() ![]() |
- DATUM: 22.11.1983
- TITEL: Educational and recreational mathematical device in the form of a band, ring or concentric rings
- PERSON: GULACK MAX A