Willsonn Sonney Orifice Computer

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Country of manufacture: USA,            Date of manufacture: abt. 1966
Diameter: 19.1 cm,      Weight: approx. 37.7 gms
Materials: All plastic
Cursor: all plastic, two sided; one line on front only
Scales: numerous specialized
Front:
Back:
Condition: C0 (Mint with all accessories )
Came with: Cardboard folder which serves as a case for the rule and holds instruction booklet

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