Eat included. Changsha Huajin United is a branch of Huajin United Patent and Trademark Agency Co., Ltd. According to a query on the official website of Huajin United Patent and Trademark Agency Co., Ltd., Changsha Huajin United provides free meals. Huajin United Patent and Trademark Agency Co., Ltd. was established in 1999 and is located in Guangzhou City, Guangdong Province. It is an enterprise mainly engaged in technology promotion and application services.