checkdigit calculation for HP-17b

[wynen]

(07-26-2015 04:45 PM)Thomas Klemm Wrote:  Have these mechanical computers for verifying numbers in Luhn's patent ever been produced?

I'm quite sure, you can find these little "computers" in the collection of the "Arithmeum",
a Museum for "Calculating in olden and modern times" in Bonn, Germany.

I've been there last Friday and it was amazing.

Hartmut (from Monheim am Rhein, Germany, near Bonn)