Home / Standards / GB 12838-1999 GB 12838-1999 Abolished Tyre valve cores for large core chamber 大芯腔轮胎气门芯 Standard Type GB ICS 83.160.10 CCS G41 Status 废止 Issue Date 1999-06-29 Implementation 2000-05-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit 中国石油和化学工业联合会