DB

Drew Mark Butler

LT Longyear Tm: 1 patents #36 of 72Top 50%
Overall (All Time): #3,243,558 of 4,157,543Top 80%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
7905161 Process of drill bit manufacture Erik M. Gaugh, Todd A. Nevenner 2011-03-15