The crank-chain driving and long stroke pumping unit described in this papes is a new type of pumping unit.
曲柄链条动滑轮式长冲程抽油机是一种新型抽油机。
The cylinder chain lower super long stroke pumping unit is a kind of up to date and high efficiency equipment.
圆柱链低矮式超长冲程抽油机是一种新型高效有杆采油设备。
The cylinder chain lower super long stroke pumping unit is a kind of up to date and high efficiency equipment.
圆柱链低矮式超长冲程抽油机是一种新型高效有杆采油设备。
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