Circular slide rule with lockable cursor arm
Circular slide rule with lockable cursor arm, plastic made by Lithocalculator Company, Calfornia, USA.
- Object Number:
- 1985-276 Pt2
- type:
- circular slide rule
Circular slide rule with lockable cursor arm, plastic, in envelope with instructions: " Eckel dial rule", Engineers' Model, made by Lithocalculator Company, Calfornia
Circular slide rule with lockable cursor arm, plastic made by Lithocalculator Company, Calfornia, USA.