trencherman
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Brother and I went to engineering school so slide rule was part of our introductory training. The coveted brand was K&E but the majority of students wielded the Japanese Hemmi, made of bamboo so costed a fraction of the American import and also for most conditions, accurate since bamboo accommodated to fluctuating humidity evenly. I never saw an example of a Chinese-made one which Life magazine mentioned in its lampoon of The Great Leap Forward as not reliable, you get 9.1 if you tried squaring 3.