The sole manufacturer with independent intellectual property rights of four-quadrant high voltage variable frequency technology.
荣信公司是国内最早对四象限中压变频技术有自主知识产权并掌握核心技术厂家。
The world's only manufacturer who complete master the core technology of High-end four-quadrant high voltage variable frequency.
荣信公司是国内外唯一掌握高端四象限中压变频技术的厂家。
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