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Patent:US5423682
| Patent: | US 5423682 |
| Title: | Numbering system teaching aid |
| Date: | 13.06.1995 |
| Place: | |
| Country: | USA |
| Person: | Hildebrandt, Raymond E. (7213 Huntcliff, West Bloomfield, |
| Company: | |
| Internal Links: | Lehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  US5423682 (espacenet), US5423682 (uspto) |
US5423682 Fig.