增抽扶正器
increasing production centralizer
玻璃钢抽油杆
fiberglass sucker rods
fiber glass reinforced plastic sucker rod
玻璃钢-钢抽油杆
Fiberglass-steel Sucker Rod
玻璃钢—钢混合抽油杆
fiberglass—steel sucker rod string
玻璃纤维增强的聚酯抽油杆
fiberglass-reinforced polyester sucker rod