MK

Masataka Kawasaki

NC Nippon Piston Ring Co.: 1 patents #120 of 208Top 60%
Overall (All Time): #2,805,358 of 4,157,543Top 70%
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Patent #TitleCo-InventorsDate
10724636 Combined oil ring Mamoru Miyamoto, Hideshi Hitosugi, Kenji Arai 2020-07-28