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

Vintage - Parallel Rolling Ruler - W H Harling of London- Draughtsman's Ruler

Fab Vintage Rolling Brass Parallel Rule Ruler Technical Draughtsman 2 Foot/ 61cm

Vintage Ebony Brass Parallel Ruler Maritime Technical Drawing Architect 6''

Antique UWW Brass & Boxwood Parallel Rolling Ruler in Wooden Box 46cm

Vintage Brass C.T & S Ltd London 17.5" Parallel Rolling Nautical Rule Charts

ANTIQUE BRASS J. HALDEN & CO NAUTICAL MARINE NAVIGATION PARALLEL ROLLING RULER

A G THORNTON MANCHESTER - ANTIQUE DARK WOOD AND BRASS PARALLEL 6" RULER VGC