Yun-Sheng Yantai Petroleum Machinery Parts Co., Ltd. was founded in 1997, is currently a two-way protection of domestic production sucker rod coupling is one of the largest enterprises.

• 烟台运盛石油机械配件有限公司创建于1997年，目前是国内生产双向保护抽油杆接箍的最大企业之一。