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2883474
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Information
Patent Grant
2883474
References
Source
Patent Number
2,883,474
Date Filed
Not available
Date Issued
Tuesday, April 21, 1959
65 years ago
CPC
H04Q1/4465 - the same frequency being used for all signalling information
US Classifications
370 - Multiplex communications
340 - Communications: electrical
379 - Telephonic communications
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