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3098179
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Information
Patent Grant
3098179
References
Source
Patent Number
3,098,179
Date Filed
Not available
Date Issued
Tuesday, July 16, 1963
62 years ago
CPC
H04Q1/4465 - the same frequency being used for all signalling information
H04J1/14 - Arrangements providing for calling or supervisory signals
US Classifications
361 - Electricity: electrical systems and devices
340 - Communications: electrical
455 - Telecommunications
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