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3393272
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Information
Patent Grant
3393272
References
Source
Patent Number
3,393,272
Date Filed
Not available
Date Issued
Tuesday, July 16, 1968
56 years ago
CPC
G04C21/30 - with provision for a number of operations at different times
G08B3/10 - using electric transmission using electromagnetic transmission
US Classifications
379 - Telephonic communications
340 - Communications: electrical
968 - Horology
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