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Buy Slide Rule. Circular slide rule for stadia professional. Do not hold it top and bottom, thus squeezing the slide.

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What's all the more remarkable is that today it is possible to pick up 140+ function scientific calculators for as little as $5! We have something for everybody, even a swap and sell area for visitors. Sales price (tax included)： 3,000 jpy. This slide rule is a genuine classic and deservedly so, with one of the best scale layouts ever devised for professional technical work.