Non-constant-speed and non-symmetrical-crank-counterweight efficient and energy-saving oil pumping machine
Non-constant-speed and non-symmetrical-crank-counterweight efficient and energy-saving oil pumping machine
- CN 103,148,186 A
- Filed: 03/15/2013
- Published: 06/12/2013
- Est. Priority Date: 03/15/2013
- Status: Active Application
- EN CH
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- Pin
