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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
CONTROLLER / NoName
Controller Calculator KG
Germany
Metal
1950s
Ø 7.5 cm
General calculations
Notes:
German registered design but the lack of a model no. denotes an early production date. Later versions had model numbers 75 R or 75 W and the K scale was replaced by a CI scale.
Image 1
Image 2
Image 3
Image 4
