Concise Ruler Circular Slide Rule No. 300 100829 Made IN JAPAN 110mm

Ruler Circular Slide Rule No. 270 Made IN JAPAN

Concise ruler 28N English Version Circular slide rule made in Japan *US seller

Concise Ruler Circular Slide Rule No. 300 100829 Made IN JAPAN 110mm

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

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

Concise Ruler Circular Slide Rule No.300 100829 110mm

CONCISE Circular slide rule NO.28N (English Ver.) Made in Japan NEW