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Seki Akira

KC Kawatetsu Mining Co.: 1 patents #20 of 33Top 65%
Overall (All Time): #3,916,007 of 4,157,543Top 95%
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Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4973462 Process for producing high purity silica Yuuki Narita, Shunroh Nagata 1990-11-27