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| Manufacturer | CB Certificate No. | IECQ Certificate No. | | CB/NAI | Issue Date | Status | |
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| Octekconn Enterprise Co, Ltd [Taiwan] | |
| | T1040 | M-IECQ ECB 04.0039 | | ECB (United States of America) | 1999/08/26 | Cancelled | |
| OITA PRECISION CORPORATION [Japan] | |
| OKI ENGINEERING CO Ltd [Japan] | |
| Oki Engineering Co, Ltd [Japan] | |
| ORION SCIENCE CO LTD [Japan] | |
| Oxley Developments Company Ltd [United Kingdom] | |
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