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3536839
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Information
Patent Grant
3536839
References
Source
Patent Number
3,536,839
Date Filed
Not available
Date Issued
Tuesday, October 27, 1970
53 years ago
CPC
H04M11/04 - with fire, police, burglar, or other alarm systems
H04M3/64 - Arrangements for signalling the number or class of the calling line to the operator
H04M11/045 - using recorded signals
US Classifications
379 - Telephonic communications
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