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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
PERRYGRAF / 15 inch Circular Slide Rule
PERRYGRAF
USA
Cardboard
1955
Ø 16.5 cm
Basic calculations
Notes:
Unusually for Perrygraf a true slide rule and not a slide chart but the model name is boastfully deceiving as the diameter is just 6.5 inches.
Image 1
Image 2
Image 3
