With the analysis among 54 patents, we discovered top 38 key players by total patent application. Sharp Corp., Seiko Epson Corp., Control Data Corp. are dominant in this area. They take 22.22% of the total patent filing.
Toyama-ken, Japan
Patent: 4
Nagano-ken, Japan
Patent: 4
Minnesota, United States
Patent: 4
California, United States
Patent: 4
Aichi-ken, Japan
Patent: 3
Texas, United States
Patent: 2
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