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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Disk on plate
United States Steel Hardenability Slide rule
Graphic Calculator Company
USA
Plastic
c. 1970
20.3 cm x 20.3 cm
Steel Industry
Notes:
"1) Used to determine hardenability for vatious steel compositions 2) Three concentric disks on the front side and two on the reverse, each with clear cursors"
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Image 6
