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Patent:DE146381
| Patent: | DE 146381 |
| Title: | Teilbare Scheibe zur Veranschaulichung der Bruchrechnung |
| Date: | 10.12.1902 |
| Place: | Dresden-Pleschen |
| Country: | Germany |
| Person: | Därrschmidt, Gustav Julius |
| Company: | |
| Internal Links: | Rechenlehrmittel |
| Keywords: | Schule, Lehrmittel |
| Link to the patent office: (without guarantee) |  DE146381 |
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