1, Gansu Lanzhou Food Group Co., Ltd.: This company is one of the well-known food production enterprises in Gansu Province, producing all kinds of foods, including butter.

2. Gansu Tianshui Food Co., Ltd.: This company is located in Tianshui City, Gansu Province, specializing in food production and sales, and may also produce butter and other products.

3. Qingyang Food Processing Factory in Gansu Province: Qingyang City is a city in Gansu Province, which may produce butter and other foods.