Type name / number: 8100 Sundstrand's Underwood Adding machine (hand driven)
Production / SN: 321050
Calculating principle: Rocking Segment
Calculating functions: Add, Subtract with nine complements
Input accuracy 8 digits
Calculating accuracy: 8 digits
Extra's: The sides of the case and the bottom plate are painted with a structure-paint
Designer: The Sundstrand brothers
Production year: 1940
Case material: Aliuminium
Weight: 13,7 Kg
External links:  
Previous owner: M. Gutwein, Oberursel, Germany
Cosmetic imperfections:
(I accuse no one):
Whole machine is extra ordinary well kept!!!
Date of receiving: 2012-08-25 During our summer holiday trip back home picked up
Machine story: 2012-08-27
Calculating test is showing a perfect working machine! even the ink ribbon is not dried-out.
Due to strange / unknown case mounting, I have not see the inside mechanics.


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