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Patent:US6386880
| Patent: | US 6386880 |
| Title: | Numerical problem solving game |
| Date: | 14.05.2002 |
| Place: | 93-10 214th St., Queens Village, NY 11428 |
| Country: | USA |
| Person: | Bryant, Wilbert |
| Company: | |
| Internal Links: | Lehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US6386880 (espacenet), US6386880 (uspto) |
Aus der Patentschrift US6386880
- Patent Family: ( Patent:US6386880, Patent:US2002015935 )