| 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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