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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Circular and Spiral Slide Rules
CONCISE / 28
Concise International Co.
Japan
Plastic
1950s
Ø 8.4 cm
Basic calculations
Notes:
Typically as a branded give away the commonest slide rule model. This promotional version with an impressive set of conversion factors on the back was made for oil major Shell. The dating is derived from the style of the Shell pectin logo.
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