DH

Dexin He

Overall (All Time): #2,106,512 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
7938198 Rotary digging and compression enlarging driller and boring method — 2011-05-10
6217260 Downhole reamer with double acting dual piston cylinder — 2001-04-17