WO2017124857A1
|
|
Balanced tower oil pumping machine
|
WO2017124855A1
|
|
Force balance beam-pumping unit
|
CN105443083A
|
|
Equilibrium beam-pumping unit
|
CN105545256A
|
|
Balance type tower oil pumping machine
|
CN103046905A
|
|
Energy-saving balance walking beam pumping unit
|
CN103046904A
|
|
Energy-saving tower-frame pumping unit
|
WO2012089006A1
|
|
Oil pumping unit used for many wells
|
WO2010111911A1
|
|
Wheel pumping unit
|
WO2009009983A1
|
|
A balance type oil beam-pumping unit
|
WO2009009920A1
|
|
A balance pumping unit with a walking beam
|
CN101037936A
|
|
Gearless transmission oil pumping machine
|
CN1740512A
|
|
Balance weight protector for oil pumping unit
|
WO2006074578A1
|
|
Oil-pumping workover rig
|
CN1710248A
|
|
Oil-pumping workover rig
|
CN1540132A
|
|
Method for manufacturing balanced weight body of oil pumping unit
|
CN1529036A
|
|
Oil-pumping workover rig
|