Vintage Concise CTCS-552 Circular Slide Rule Conversion Tables NUPRO Calculator

Sama & Etani Vintage Professional Concise Science Tables and Circular Slide Rule

Sama and Etani reference tables and circular slide rule

VTG 1967 Sama & Etani CTCS-552 Concise Science Tables & Circular Slide Rule

VTG 1960 Monsanto CTCS-552 Concise Science Tables & Circular Slide Rule

Tetran FTE CTCS-552 Sana & Etani Circular Pocket Slide Rule + Data Card

Circa 1970, Concise Conversion Tables and Circular Slide Rule. Model EE-112.

1968 vintage Sama & Etani Concise CHEMICAL TABLES and Circular Slide Rule