History

Time	Change
2013-07-20 08:35:57+00:00	Created
2013-07-20 08:35:57+00:00	Associated with GB 16959
2013-07-20 08:35:57+00:00	Associated with GB 16959-97
2020-10-10 06:06:23+00:00	Associated with GB 16959-1997
2022-10-22 02:59:53+00:00	Associated with GB/T 20542
2022-10-22 02:59:53+00:00	Associated with GB/T 22238-2008
2022-10-22 02:59:53+00:00	Associated with GB 22238
2022-10-22 02:59:53+00:00	Associated with GB/T 22238
2022-10-22 02:59:53+00:00	Associated with GB 20542
2022-10-22 02:59:53+00:00	Associated with GB/T 20542-2006