A coupler drive system for pumping unit is developed by using the theory of hydraulic drive of coupler.

运用耦合器液力传动原理，研制成功抽油机耦合器传动系统。

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A coupler drive system for pumping unit is developed by using the theory of hydraulic drive of coupler.

运用耦合器液力传动原理，研制成功抽油机耦合器传动系统。

youdao