However, according to Article 69 of the Patent Law, if you can prove that you have been manufacturing the same product or using the same method before applying for a patent, or are ready to implement it, then you have the right of defense of the right of first use, that is, you can continue to manufacture the product and use the method within the original scope, which does not constitute infringement.
At the same time, you can also file a request for invalidation of a patent, with the number of patents and existing technology as the legitimate reasons.