Inventor

ZHANG RUNAN

CN2 patents

Patents

2 patents

US10975628B2Apr 13, 2021

Drill bit nozzle and drill bit

SEED TECH CORP LTD1 citations55

US11053743B2Jul 6, 2021

Polycrystalline diamond compact drill bit and oil well drilling apparatus having the same

SEED TECH CORP LTD0 citations43