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Patent:DE1101824
| Patent: | DE 1101824 |
| Title: | Vorrichtung zum Ziehen negativer Summen |
| Date: | 09.03.1961 |
| Place: | Zürich und Niederstotzingen |
| Country: | Germany |
| Person: | Gelling, Helmut (P) |
| Company: | Walther (P) Büromaschinen GmbH |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE1101824 |
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