They actually gave this "Curta" guy a patent on this? When I saw it I
recognized it as a new version of a MUCH older device called the "Babbidge
Difference Engine", an entirely mechanical gear-filled device that performed
mathematical calculations. Charles Babbidge invented it in the 19th
century. Looks like Curta put one over on the patent office.
http://www.nmsi.ac.uk/piclib/imagerecord.asp?id=COMC100238%20
> http://home.teleport.com/~gregsa/curta/
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