RH

Rolf Helle

RI Riken: 1 patents #679 of 1,824Top 40%
Overall (All Time): #3,383,720 of 4,157,543Top 85%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
7207571 Steel piston ring Hideki Yoshida, Akira Sato 2007-04-24