Home / Standards / GB/T 6550-1986 GB/T 6550-1986 Active Information processing -- 9-Track，127mm wide magnetic tape for information interchange recorded at 63rpmm， phase encoded 信息处理交换用9磁道12.7毫米宽63行/毫米调相制记录磁带 Standard Type GBT ICS 35.220.20 CCS G83 Status 现行 Issue Date 1986-03-28 Implementation 1987-04-01 Responsible Dept 国家标准委 Drafting Unit N/A