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Photos of Mechanical Calculator Internals - Les Bell - 11-14-2014 05:21 AM
There's quite an interesting article on Wired, featuring photographs of the internals of old mechanical calculators, as well as comments from a collector.
The same photographer has another series devoted to mechanical calculators, too.
RE: Photos of Mechanical Calculator Internals - Garth Wilson - 11-14-2014 06:50 AM
The cost of designing and tooling up to build those had to be staggering!