| Manufacturer | CB Certificate No. | IECQ Certificate No. | | CB/NAI | Issue Date | Status | |
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 | WAFER WORKS CORP (Semiconductor Material... [Taiwan] |  |
| Wafer Works Corporation [Taiwan] |  |
 |  | T1070 | M-IECQ ECB 04.0070 | | ECB (United States of America) | 2000/02/15 | Cancelled |  |
| Walsin Lihwa Corp [Taiwan] |  |
 | Walsin Technology Corporation Quality La... [Taiwan] |  |
| Walsin Technology Corporation [Taiwan] |  |
 | Weald Electronics Limited [United Kingdom] |  |
| Wearness Electronics Zhongshan Ltd [China] |  |
 | Well Fortune Technical Co, Ltd [Taiwan] |  |
| Welwyn Components Limited [United Kingdom] |  |
 | WENZHOU LUCHENG ZHENGTAI RESISTOR CO, LT... [China] |  |
| Wide Band Signal Processing Lab, EW, ICR... [Taiwan] |  |
 | WILLIAMSON ELECTRONIQUE [France] |  |
| WIMA-Kondensatorenfabrik [Germany] |  |
 | Winbond Electronics Corporation [Taiwan] |  |
| WINSTEK SEMICONDUCTOR CORPORATION [Taiwan] |  |
 | Winstek Semiconductor Co, Ltd Reliabilit... [Taiwan] |  |
| Woo Sung Pre Ind Co, Ltd [Korea, Republic of] |  |
 | WUHAN GUANXING ELECTRONIC CO, LTD [China] |  |
| WUHAN TELECOMMUNICATION DEVICES CO, LTD [China] |  |
 | WUXI CHINA RESOURCES HUAJING MICROELECTR... [China] |  |
| WUXI CMC ELECTRONICS CO, LTD [China] |  |
 | WUXI SHARP ELECTRONIC COMPONENTS CO, LTD [China] |  |
| WUXI TOYO ELECTRIC CO, LTD [China] |  |
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