Read it carefully..
Is this how Chinese Scientists confess sins?
By applying for a patent?
Before 2020 WIV used Micro-Chem Plus which corrodes stainless steel & HEPA filters, Trust a me!
In 2020 WIV filed a patent to solve these issues
https://t.co/prq3qddfx5
h/t @TheSeeker268 https://t.co/G3bLTAdbDm