Concise ruler Circular slide rule Machine tool 100867 NEW Japan. Circular slide rule machine tools The slide rule is designed to calculate the main machining time when using a machine tool drilling machine, lathe, milling machine, tapering machine, etc. It is intended for engineers. Back: List of cutting speeds for mild steel and semi-steel cast iron Comes with a special storage case and instruction manual Details Size Diameter approx. 120mm Remarks Main material: Vinyl chloride Made in Japan.
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