OS

Ofuyu Sakai

NC Nippon Piston Ring Co.: 1 patents #120 of 208Top 60%
Overall (All Time): #2,602,813 of 4,157,543Top 65%
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Patent #TitleCo-InventorsDate
11739840 Piston ring Kyoichi Ikeya, Makoto Kajiwara 2023-08-29