Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"TAEBEL TERRY A" Page 1

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发明授权
Telephone signaling conversion circuit for pulses and tones 失效
Title translation: 用于脉冲和音调的电话信令转换电路

公开(公告)号：US3315039A

公开(公告)日：1967-04-18

申请号：US31246363

申请日：1963-09-30

Applicant: BELL TELEPHONE LABOR INC

Inventor： GEBHARDT ROBERT C , SPENCER JR ALBERT E , TAEBEL TERRY A

IPC: H04Q1/50 , H04Q11/04

CPC classification number: H04Q11/04 , H04Q1/50

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