History

Time	Change
2020-10-10 06:11:11+00:00	Created
2020-10-10 06:11:11+00:00	Associated with GB 21669
2020-10-10 06:11:21+00:00	Associated with GB/T 21669-2008
2020-10-10 06:11:21+00:00	Associated with GB/T 21669
2020-10-10 06:28:09+00:00	Associated with GB 21669-2008