Inventor

ZHENG YUEMING

CN2 patents

Patents

2 patents

US10429274B2Oct 1, 2019

Vertical high speed testing device for spiral seal of cone bit bearing

UNIV SOUTHWEST PETROLEUM0 citations48

US10393615B2Aug 27, 2019

Horizontal high speed testing device for spiral seal of horizontal cone bit bearing

UNIV SOUTHWEST PETROLEUM0 citations48