Concise Circular Slide Rule No.270

Very nice SUN HEMMI No. 153 Bamboo Duplex Slide Rule, vintage circa 1933 - 1942.

Frederick Post Versalog Slide Rule 1460 Hemmi Japan Brown Leather Case Vintage

VTG CONCISE CIRCULAR SLIDE RULE W/CASE & INSTRUCTIONS JAPAN NOS

Vintage Keuffel & Esser DECI-LON 68 1100 Slide Ruler, Instructions, Case & Book

Concise Ruler Circular Slide Rule No. 270N 100812 F/S w/Tracking# New from Japan

EUGENE DIETZGEN - Vintage Decimal Trig Type Log Slide Rule Cat No B-1734 w/Case

Vintage Celanese Celcon Slide Rule with Leather Case - 004415 Doric K&E Co.