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Patent:DE395534
| Patent: | DE 395534 |
| Title: | Rechenlehrmittel |
| Date: | 20.05.1924 |
| Place: | |
| Country: | Germany |
| Person: | Herrmann, Karl (P) |
| Company: | |
| Internal Links: | Rechenlehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE395534 |
Aus der Patentschrift DE395534
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