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United States Patent
3,501,591
Issue Date:
March 17, 1970
Current U.S. Class:
370/485
; 370/496
Current International Class:
H04Q 3/62 (20060101); H04Q 11/00 (20060101); H04Q 11/02 (20060101); H04M 7/16 (20060101)
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