Walking-beam balancing, diameter-adjusting and torque-changing energy saving oil pumping machine
Walking-beam balancing, diameter-adjusting and torque-changing energy saving oil pumping machine
- CN 2,312,323 Y
- Filed: 12/31/1997
- Issued: 03/31/1999
- Est. Priority Date: 12/31/1997
- Status: Active Grant
- EN CH
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- Pin
