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United States Patent
2,908,870
Issue Date:
October 13, 1959
Current U.S. Class:
331/87
; 331/148; 342/202
Current CPC Class:
H03K 3/78 (20130101)
Current International Class:
H03K 3/00 (20060101); H03K 3/78 (20060101)
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