VINTAGE 30CB UNIQUE ADJUSTABLE TRIANGLE RULE RULER MEASURE

Antique ebony and brass parallel rule for navigation/drafting

VINTAGE 25CB UNIQUE ADJUSTABLE TRIANGLE RULE RULER MEASURE

Bundle of Engineering Drawing Architectural Scientific Technical Rulers Rules

Vintage Unique Universal 1 Slide Rule Ruler Measure

Vintage UNIQUE UNIVERSAL II SLIDE RULE Made In England RULER

Vintage Boxwood Engineers Engine Divided 6" Rule Ruler Hall Harding

Vintage Wooden Engineer Ruler Scale Rule Brough Engineer & Surveyor Derby Pair