Tsingtao High-end completed tens of millions of Pre-A round of financing
Qingda High-end is a developer of negative oxygen ion generator. Its Qingda Youxian negative oxygen ion generator can be sprayed on the surface of any object except glass and metal to release negative oxygen ions in a long-term, valid for up to 10 years. Recently, Tsingda High-end officially completed the tens of millions of RMB […]
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