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Patent:DE145470
| Patent: | DE 145470 |
| Title: | Rechenkasten für Schulen |
| Date: | 16.03.1902 |
| Place: | Zeitz |
| Country: | Germany |
| Person: | Lange, Georg (P) |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE145470 |
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