Concise Ruler Circular Slide Rule No. 270N 100812 Made IN JAPAN 100mm

It is a computational scale that can be calculated not only calculations such as multiplication, division, two -square, three -bill, etc. Other than addition and subtraction. You can also calculate cubes, square and triangular functions. Calculation: General exclusion, proportional (index hundred minutes), square, cubic and triangular functions. Sales: A, D · C, CI, B, K, L (surface) · DI, D.

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