BS 939:1977
$102.76
Specification for engineers’ squares (including cylindrical and block squares)
| Published By | Publication Date | Number of Pages |
| BSI | 1977 | 22 |
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.
