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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Linear
Portland Speed-Time-Distance Calculator
Blundell Harling Ltd.
England
Plastic
c. 2004
5.6 cm x 17 cm
Sea Navigation
Notes:
Simple slide rule to calculate a variable when the other two are given. Note - part of Blundell still making slide rules!
Image 1
Image 2
Image 3
