Circular slide rule and time zone scale

Made:
1947 in Illinois
Circular slide rule and time zone scale, cardboard and plastic

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Circular slide rule and time zone scale, cardboard and plastic
Science Museum Group
© The Board of Trustees of the Science Museum

Circular slide rule and time zone scale, cardboard and plastic, made 1947 by Perrygraf, Illinois for National, Massachusetts

Details

Category:
Mathematics
Object Number:
1985-263
type:
circular slide rule
credit:
Crosby, R.C.