IS/ISO 9180 : 1998 : Black Leads for Wood-Cased Pencils - Classification and Diameters

NATIONAL FOREWORD

This Indian Standard which is identical with IS0 9180 : 1988 ‘Black leads for wood-cased pencils - Classification and diameters’, issued by International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on the recommendation of the Optical and Mathematical Instruments Sectional Committee (LM 20) and approval of the Light Mechanical Engineering Division Council.