F - Mech Eng,Light,Heat,Weapons – 04 – D
Inventor
F - Mech Eng,Light,Heat,Weapons
04
D
Inventor
Country: Ussr
Bottom-hole multistart screw motor
Downhole sectional screw motor and method of oriented...
Helical down-hole machine
Hinge joint of bottom-hole helical planetary hydraulic machine
Reduction unit of drilling motor
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