Vintage "Mathema" Boxed Nautical Captain Fields Parallel Ruler 15inch (38cm).

Vintage Rollertec Amazing Rolling Ruler Geometry Tech Drawing & Navigation 30cm

Vintage Draftsman’s Ebonite Roller – 30cm Lathe-Turned Rolling Ruler Component (

Linex 433 30cm Architect’s/Draughtsman’s Ruler - Technical Drawing Tool

Capt Fields Pattern Parallel Navigation Ruler

Vintage Blundell Harling, Navigational Protractor & Parallel Ruler 250mm

Vintage 1963 London Parallel Rule Ebony & Brass Draughtsman Tool

Vintage BRL Students Slide Ruler, 10 Inch, 3 Part, Engineers, In Original Box