- Fowler's "Twelve Ten" Calculator / Slide Rule
- Fowler's "Twelve Ten" Calculator / Slide Rule
- Fowler's "Twelve Ten" Calculator / Slide Rule
- Fowler's "Twelve Ten" Calculator / Slide Rule
- Fowler's "Twelve Ten" Calculator / Slide Rule
Fowler's "Twelve Ten" Calculator / Slide Rule
- £110.00