Patent:US5039603
Patent: | US 5039603 |
Titel: | Educational system for teaching counting and equation solving strategies |
Datum: | 13.08.1991 |
Ort: | (2315 Broad Pke., Cinnaminson, NJ 08077 |
Land: | USA |
Person: | Pocius, Frank (P) |
Firma: | |
Links im Rechnerlexikon: | Lehrmittel |
Schlagworte: | |
Link zum Patentamt: (ohne Garantie) | US5039603 (espacenet), US5039603 (uspto) |
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- Patent Family: ( Patent:AU630455B, Patent:AU5589290, Patent:CA2017482, Patent:CA2017482, Patent:GB2244366, Patent:GB2244366, Patent:GB9011542D, Patent:US5039603 )