Albert Nestler AG Nr. 21 Darmstadt
| Manufacturer: | Albert Nestler AG (Germany) |
| OEM: | https://www.nicewatchuk.com/ (ismeretlen) |
| OEM model: | n.a. |
| Mfg. date: | 1940-es évek |
| Size: | 295×40×14 mm |
| Purpose: | standard slide rule |
| Material: | body: wood scales: celluloid |
| Scale length: | 25 cm (10-inch) |
| Scale order: | Darmstadt front: cm L / K Ah | Bh CIh Ch | Dh P / Sd Td back: | LL1 LL2 LL3 | |
| Window: | glass with metal frame with 3+1+1 indices |
