Results for « 纳 皮尔 筹 » (cmn)
03807334-n
纳 皮尔 算筹, 纳皮尔算筹, 纳皮尔筹, 纳 皮尔 筹
Napier's bones, Napier's rods
     a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier

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Maintainer: Francis Bond <bond@ieee.org>