Home / Standards / GB/T 6996.13-1986 GB/T 6996.13-1986 Abolished Grayscale test chart B of transparencies fortelevision 透射式电视灰度测试图 B型 Standard Type GBT ICS 33.140 CCS M70 Status 废止 Issue Date 1986-11-20 Implementation 1987-10-01 Responsible Dept 工业和信息化部（电子） Drafting Unit N/A