With the analysis among 36 patents, we discovered top 22 key players by total patent application. Proterial Ltd., Kubota Corp., Kobe Steel, Ltd. are dominant in this area. They take 41.67% of the total patent filing.
Chiba-ken, Japan
Patent: 8
Kanagawa-ken, Japan
Patent: 2
Aichi-ken, Japan
Patent: 1
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