Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"GUNTER ERNEST M" Page 1

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发明授权
Ringing signal detector which distinguishes ringing signal from periodic noise 失效
Title translation: 环形噪声检测信号检测器

公开(公告)号：US3435152A

公开(公告)日：1969-03-25

申请号：US3435152D

申请日：1966-05-13

Applicant: BELL TELEPHONE LABOR INC

Inventor： GUNTER ERNEST M , SIMON JAMES L

IPC: H04M9/00 , H04M3/00

CPC classification number: H04M9/006

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