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Patent:DE265451
| Patent: | DE 265451 |
| Title: | Rechenlehrvorrichtung für den Zahlenkreis von 1 - 20 |
| Date: | 08.10.1912 |
| Place: | Grohn-Vegesack |
| Country: | Germany |
| Person: | Mahnken, Hermann (P) |
| Company: | |
| Internal Links: | Rechenlehrmittel |
| Keywords: | Schule, Lehrmittel |
| Link to the patent office: (without guarantee) |  DE265451 |
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