Electronic Equations calculator slide chart / slide rule (S864) D10

Description

Electronic Equations Calculation slide rule
3 by 10 inch slidechart / sliderule
Sigma Instruments, Inc
South Braintree 85, Mass
Copyright 1957
made by Perrygraf, Maywood, Ill
Construction:  card stock.
Condition of item:  very good, some foxing.
Refer to the pictures.
Stock number:  S-864        0-1.1     D-10
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If you see a sticker with letters and numbers, it refers to my inventory stock number.  It can be removed.
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