Home / Standards / GB/T 4457.2-2003 GB/T 4457.2-2003 Active Technical drawing--Drawing presentation--General principles of leader lines and reference lines 技术制图 图样画法 指引线和基准线的基本规定 Standard Type GBT ICS 01.100.01 CCS J04 Status 现行 Issue Date 2003-04-29 Implementation 2003-12-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委