This 1942 ad for a comptometer is just perfect because first of all, I had no idea what a comptometer was (a mechanical calculator, basically) and second, the spec sheet is wonderful: no glare dials, elimination of non-essential zeroes, and a "Keystroke Censor."
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All I can think is that the person in this photo is probably dead now. Am I alone in that thought?
(Full disclosure: I went to a funeral today.)