With the analysis among 94 patents, we discovered top 31 key players by total patent application. Hitachi Ltd., Siemens AG, Avro are dominant in this area. They take 22.34% of the total patent filing.
Massachusetts, United States
Patent: 5
Taiwan Province, China
Patent: 4
Massachusetts, United States
Patent: 3
Oregon, United States
Patent: 3
California, United States
Patent: 3
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