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Yu and Donghua Chemical President Mr. Yen jointly established Hualong corp. in 1992, a subsidiary of Donghua Chemical Group. Applied for producing Paraquat both Tech and Formulation. formally approved the application of the production and sales of Paraquat. Permanent license was given to Baofeng, the first one to local Paraquat manufacturer. 5L bottle Paraquat 276 SL.