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Patent:US5725380
| Patent: | US 5725380 |
| Title: | Combination writing board and abacus |
| Date: | 10.03.1998 |
| Place: | |
| Country: | USA |
| Person: | Kennelly, Kim (140 Ingrid Pl., Oldsmar, FL 34677) |
| Company: | |
| Internal Links: | Kugelrechner |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US5725380 (espacenet), US5725380 (uspto) |
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