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Patent:DE160122
| Patent: | DE 160122 |
| Title: | Rechenapparat mit senkrechten Reihen verschiebbarer Kugeln, welche die Zahlenstellen darstellen |
| Date: | 30.06.1904 |
| Place: | Essen |
| Country: | Germany |
| Person: | Monachimoff, Alexander (P) |
| Company: | |
| Internal Links: | Rechenlehrmittel |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DE160122 |
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