标准号:IS 3209-1989
发布日期:1990/5/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围:This standard covers the requirements of spring bow compasses for engineers' drawing instruments of the following types:a) Spring bow pen,b) Spring bow pencil,c) Spring bow divider, andd) Spring bow reversible pen-pencil.