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I have one of these complete with original manual and beautiful box-jointed wooden case. My wife received it from National Life Insurance Co. where she worked in 1950, where they were still in occasional use when they did not have enough mechanical calculators. I used it to check the accuracy of student papers while teaching trigonometry in freshman college classes. (The students had to use 5-place log tables!) It is a beautifully built old machine first put on the market around 1884, mine was sold about 1932.. The great majority of you who read this (that's around 2 out of the three of you) cannot imagine the magnitude of the changes in computing that has occurred in my lifetime. Pencil and paper to slide rules (6 inches to 50 feet in length); to mechanical to electrical to electronic adding machines; to vacuum tube to discrete transistor to lo-res integration to hi-res integration computers; from massive building filling computers to faster, increased power on a desk-top and in the pocket., I have seen and used it all and I am still blown away at the unbelievable quantity data available on internet. I hope all you kids appreciate it (That's anybody 60 years old and under.)