With the analysis among 272 patents, we discovered top 58 key players by total patent application. Siemens AG, STC Plc, Western Electric Co., Inc. are dominant in this area. They take 29.41% of the total patent filing.
Bayern, Germany
Patent: 41
Western Electric Co., Inc.
Georgia, United States
Patent: 16
Noord-Holland, Netherlands
Patent: 7
International Standard Electric Corp.
New York, United States
Patent: 7
Felten & Guilleaume Energietechnik AG
Nordrhein-Westfalen, Germany
Patent: 6
DeTeWe Deutsche Telephonwerke AG & Co. KG
Telefonaktiebolaget LM Ericsson
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