Concise ruler 28N 100973 English Ver. Circular slide rule

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

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

Concise 100973 Ruler Circular Slide Rule 28N Diameter 84mm From Japan

Concise Circular Slide Rule NO. 28N 100973 (English Version) Ruler w/ Tracking #

Ruler Circular Slide Rule No. 270 Made IN JAPAN

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

Concise Slide Rule Circular No 28 Made in Japan Takeda Combustion Engineering