| Date Time | Honorary Title | Units Issued |
|---|
 | 2025-01 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 1 for certificate of honor | Sample 1 for issued by the unit |
| 2024-02 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 2 for certificate of honor | Sample 2 for issued by the unit |
| 2023-03 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 3 for certificate of honor | Sample 3 for issued by the unit |
| 2022-04 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 4 for certificate of honor | Sample 4 for issued by the unit |
| 2021-05 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 5 for certificate of honor | Sample 5 for issued by the unit |
| 2020-06 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 6 for certificate of honor | Sample 6 for issued by the unit |
| 2019-07 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 7 for certificate of honor | Sample 7 for issued by the unit |
| 2018-08 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 8 for certificate of honor | Sample 8 for issued by the unit |
| 2017-09 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 9 for certificate of honor | Sample 9 for issued by the unit |
| 2016-010 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 10 for certificate of honor | Sample 10 for issued by the unit |
| 2015-011 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 11 for certificate of honor | Sample 11 for issued by the unit |
| 2014-012 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 12 for certificate of honor | Sample 12 for issued by the unit |
| 2013-013 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 13 for certificate of honor | Sample 13 for issued by the unit |
| 2012-014 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 14 for certificate of honor | Sample 14 for issued by the unit |
| 2011-015 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 15 for certificate of honor | Sample 15 for issued by the unit |
| 2010-016 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 16 for certificate of honor | Sample 16 for issued by the unit |
| 2009-017 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 17 for certificate of honor | Sample 17 for issued by the unit |
| 2008-018 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 18 for certificate of honor | Sample 18 for issued by the unit |
| 2007-019 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 19 for certificate of honor | Sample 19 for issued by the unit |
| 2006-020 | QINGDAO YIFENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Sample 20 for certificate of honor | Sample 20 for issued by the unit |
