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1.发明授权
公开(公告)号：US3612773A
公开(公告)日：1971-10-12
申请号：US3612773D
申请日：1969-07-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： RIEHM CHARLES E JR
CPC classification number: H03B5/24 , H03B2201/0283 , H04M1/50
Abstract: Signal frequency combinations in a multifrequency signal generator are produced selectively by establishing conductive paths through switched insulated-gate field-effect transistors (IGFETS) to connect respective frequency determining elements into the oscillator circuits.
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