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BS 939 77th Edition, September 30, 1977
Complete Document
Specification for engineers' squares (including cylindrical and block squares)
Includes all amendments and changes through Amendment 1, April 1983
Page Count:22
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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.