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Patent:DE452590
| Patent: | DE 452590 |
| Title: | Lehrmittel |
| Date: | 18.11.1927 |
| Place: | franz nimtz |
| Country: | Germany |
| Person: | |
| Company: | Anschauungstafel fuer den Rechenunterricht |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE452590 |
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