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Toru Tsukui

NC Nippon Piston Ring Co.: 1 patents #120 of 208Top 60%
Overall (All Time): #4,156,821 of 4,157,543Top 100%
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Patent #TitleCo-InventorsDate
10520085 Combined oil ring Yasuyuki Murata, Kenji Arai, Ryosuke Kamata, Hideshi Hitosugi, Kazumoto Takahashi 2019-12-31