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3737858
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Information
Patent Grant
3737858
References
Source
Patent Number
3,737,858
Date Filed
Not available
Date Issued
Tuesday, June 5, 1973
51 years ago
CPC
H04Q9/16 - by predetermined number of pulses
G08B26/002 - only replying the state of the sensor
G08C15/02 - simultaneously
US Classifications
340 - Communications: electrical
379 - Telephonic communications
725 - Interactive video distribution systems
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