Home / Standards / GB/T 2923-1995 GB/T 2923-1995 Active Determination of ISO speed of black-and-white pictorial still camera negative film/process systems 黑白照相负片/加工组合ISO感光度的测定 Standard Type GBT ICS 37.040.20 CCS G80 Status 现行 Issue Date 1995-12-20 Implementation 1996-08-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A