| Patent: | DR GM639849 |
| Title: | cylindrical slide rule |
| Date: | 13.11.1915 |
| Place: | Reichenbach i.Vogtland |
| Country: | German Reich |
| Person: | Tröger, Emil |
| Company: | |
| Internal Links: | |
| Keywords: | |
| Link to the patent office: (without guarantee) |  DRGM639849 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=DRGM639849) |
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