Home / Standards / GB/T 34839-2017 GB/T 34839-2017 Active Timekeeping instruments—Designs and dimensions of crowns and sealed tubes 计时仪器 柄头和密封管的设计和尺寸 Standard Type GBT ICS 39.040.01 CCS Y11 Status 现行 Issue Date 2017-11-01 Implementation 2018-05-01 Responsible Dept 中国轻工业联合会 Drafting Unit N/A