Home / Standards / GB/T 20509-2006 GB/T 20509-2006 Abolished Copper and copper alloys drawing stock for the contacting materials of electric locomotives 电力机车接触材料用铜及铜合金线坯 Standard Type GBT ICS 77.120.30 CCS H62 Status 废止 Issue Date 2006-09-26 Implementation 2007-02-01 Responsible Dept 中国有色金属工业协会 Drafting Unit 中国有色金属工业协会