Vintage Drafting Rolling Ruler with Instructions & Example Drawings Original Box | eBay
12" Standard Roll N Ruler Rolling Ruler with Instructions SAN | eBay
Alvin Drafting 6" Rolling Parallel Ruler #306
Amazon.com: Rolling Ruler Plastic Parallel Rolling Ruler, Multifunctional Drawing Design Ruler for Measuring Drafting Student School and Office, 12 Inch (1) : Office Products
Multi-Purpose Rolling Ruler
Alvin Drafting 6" Rolling Parallel Ruler #306
Westcott - Westcott 12" Rolling Ruler, Clear (ROL-12)
Amazon.com: Rolling Ruler Plastic Parallel Rolling Ruler, Multifunctional Drawing Design Ruler for Measuring Drafting Student School and Office, 12 Inch (1) : Office Products
How to Use a Parallel Glider (AKA a "Rolling Ruler") – The Postman's Knock