Professional Parallel Glider Rolling Ruler 10" PA295 by Pacific Arc

Pacific Arc PL- 08 Parallel-Glider

Roll-O-Ruler Rolling Drafting Ruler 12in Wei's CP-405

Vintage CHARVOS Inc. US NAVY Navigator's Case - Drafting Set Made in USA - Tools

Alvin Parallel Glider Rolling Ruler #296

Vintage Alvin 295 PARALLEL GLIDER Made in Israel

Alvin Parallel Glider No. 295 8 inch with Degree markings

Vintage Multi Purpose Drafting Rolling Brass Ruler Clear w/ Blue Text 5.25" Long