Circular slide rule and time zone scale

Made:: 1947 in Illinois

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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.

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Circular slide rule and time zone scale

Details

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