BS 939:1977被替代
Specification for engineers' squares (including cylindrical and block squares)
出版：British Standards Institution
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基本信息
标准编号： BS 939:1977
发布时间：1977/9/30 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：16
标准简介
Squares of try-square type in three grades of accuracy: AA, A, B; cylindrical squares in grade AA; solid form block squares in grades AA, A; open form block squares in grades A, B. Nomenclature, designation, sizes, material, manufacture, design, accuracy, marking, protection, testing.
标准备注
© British Standards Institution 2013
Replaces notes:
Replaces BS 939:1962.
Amendment notes:
AMD 4239 published 29 April 1983
替代本标准的新标准
