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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Disk
Gilson Binary
Gilson
USA
Aluminum
"c 1931, 1940's "
Dia = 21.1 cm
"Multiplication, division, trig"
Notes:
"Early binary without colored segments, note 1940 date"
Image 1
Image 2
