Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Disk
Gilson Binary (Tavella Sales Co.)
GilsonUSA
Aluminum
"c 1931, 1940's "Dia = 21.1 cm"Multiplication, division, trig"

Notes: "Early binary without colored segments, note 1940 date"


Image 1




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Image 3