Patent:DE570404
Patent: | DE 570404 |
Title: | Rechenlehrmittel |
Date: | 15.02.1933 |
Place: | |
Country: | Germany |
Person: | Roepke, Liselotte (P) |
Company: | |
Internal Links: | |
Keywords: | |
Link to the patent office: (without guarantee) | ![]() |
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