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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
Gilson / Commercial Calculator
Gilson Slide Rule Co.
USA
Metal/celluloid
1930s
Ø 12.7 cm
Business
Notes:
"Rare short-lived model. Layout includes special scales for determining time between dates, day of the week and interest from 1% to 12%. "
Image 1
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Image 5
