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Curta Calculator - System Curt Herzstark

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Curta Mechanical Calculator Type I with case
System Curt Herzstark Contina AG Mauren Liechtenstein
 

The astounding Curta is very famous, and deservedly so, for its extremely compact and pleasing design, as well as its fascinating history.
 
Here is a blurry video demonstration (Can't see the play button? try refreshing your browser via the F5 key):
 
 
 
 
 
 
 
 
 
Also check out the Pilot Mechanical Calculator
Though not as small as the Curta - it packed a nice punch for its size.         
 
Links    
 
The ultimate curta site: http://www.vcalc.net/cu.htm
The hp calculator museum: http://www.hpmuseum.org/ffcurta.htm
The vintage calculator web museum: http://www.vintagecalculators.com/html/the_amazing_curta.html
The famous and wonderful Cliff Stohl article in Scientific American may be available as a pdf here.
http://www.geocities.com/SiliconValley/Horizon/1404/curen.html
History of Calculators: http://www.nzeldes.com/HOC/Curta.htm
There is a neat virtual reality simulator (which requires download of a viewer) here.