DD

Dennis D. E. Dorosz

Overall (All Time): #2,346,806 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4572306 Journal bushing drill bit construction — 1986-02-25
4478299 Rock bit construction — 1984-10-23