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Patent:DE68400
| Patent: | DE 68400 |
| Title: | Rechenschieber |
| Date: | 13.09.1892 |
| Place: | Stuttgart |
| Country: | Germany |
| Person: | Beyerlen, Angelo (P) |
| Company: | |
| Internal Links: | Lehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE68400 |
Aus der Patentschrift DE68400