[ Company selection: All | | A | B | C | D | E | F | G | H | I | J | K | L | M | N | P | Q | R | S | T | U | V | W | X | Y | Z ] |
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 | Company | IECQ Certificate Number | | Country / location | Issue date | Status | |
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| CEL | IECQ-P LCIE 14.0001 | | France | 2015/03/30 | Cancelled | |
| Changzhou Tongbao Photoelectricity Co., Ltd. | IECQ-P NQAGB 19.0001 | | China | 2020/08/24 | Cancelled | |
| CHAOZHOU THREE-CIRCLE (GROUP) CO., LTD. | IECQ-P CEP 21.0019 | | China | 2024/08/30 | Current | |
| Charcroft Electronics Ltd | IECQ-P BSI 14.0001 | | United Kingdom | 2021/01/04 | Cancelled | |
| Charcroft Electronics Ltd | IECQ-P BSI 13.0010 | | United Kingdom | 2023/01/30 | Current | |
| CHENGDU TIEDA ELECTRONICS CORPORATION | IECQ-P CEP 18.0001 | | China | 2024/07/20 | Current | |
| CHENGDU XUGUANG ELECTRONICS CO., LTD. | IECQ-P CEP 18.0003 | | China | 2024/07/20 | Current | |
| CHINA ZHENHUA (GROUP) XINYUN ELECTRONIC COMP. & DE... | IECQ-P CEP 18.0006 | | China | 2024/07/20 | Current | |
| CHINA ZHENHUA (GROUP) XINYUN ELECTRONIC COMP. & DE... | IECQ-P CEP 18.0006-01 | | China | 2017/06/13 | Cancelled | |
| CHINA ZHENHUA (GROUP) XINYUN ELECTRONIC COMP. & DE... | IECQ-P CEP 18.0006-02 | | China | 2018/05/10 | Cancelled | |
| Chongqing Haier drum washing machine Co., Ltd | IECQ-P SGSCN 24.0005 | | China | 2024/12/24 | Current | |
| CHONGQING LIHUA TECHNOLOGY CO., LTD. | IECQ-P CEP 17.0004 | | China | 2019/11/18 | Cancelled | |
| Chongqing Rebo Lighting & Electronics Co., Ltd. | IECQ-P NQAGB 22.0002 | | China | 2023/04/12 | Cancelled | |
| Chongqing Ruibo Optoelectronics Co., Ltd. | IECQ-P NQAGB 24.0002 | | China | 2024/05/27 | Current | |
| Chung Kwang Electric Wire & Cable Co., Ltd. | IECQ-P ULTW 12.0003 | | Taiwan | 2016/01/26 | Cancelled | |
| Cloudnine Information Technologies Co., Ltd. | IECQ-P SGSCN 25.0018 | | China | 2025/05/08 | Current | |
| Cloudnine Information Technologies Co., Ltd. | IECQ-P SGSCN 25.0018-01 | | China | 2025/05/08 | Current | |
| Conquer Electronics Co., Ltd. | IECQ-P ULTW 12.0005 | | Taiwan | 2023/10/22 | Cancelled | |
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