With the analysis among 55 patents, we discovered top 17 key players by total patent application. 3M Innovative Properties Co., Cutler-Hammer, Inc., National Equipment Corp. are dominant in this area. They take 16.36% of the total patent filing.
Minnesota, United States
Patent: 3
New York, United States
Patent: 3
New York, United States
Patent: 3
Texas, United States
Patent: 1
Indiana, United States
Patent: 1
British Columbia, Canada
Patent: 1
Ohio, United States
Patent: 1
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