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Patent:CH221635
| Patent: | CH 221635 |
| Title: | Als Rechenschieber ausgebildetes Schreibgeraet |
| Date: | 15.06.1942 |
| Place: | |
| Country: | Switzerland |
| Person: | Fahrni, Karl (P) |
| Company: | |
| Internal Links: | Rechenschieber |
| Keywords: | |
| Link to the patent office: (without guarantee) |  CH221635 |
Aus der Patentschrift CH221635
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