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

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发明授权
Private line transfer switching circuit 失效
Title translation: 专线转接开关电路

公开(公告)号：US3001027A

公开(公告)日：1961-09-19

申请号：US2067060

申请日：1960-04-07

Applicant: BELL TELEPHONE LABOR INC

Inventor： ARMSTRONG JAMES M , GODDARD MYRON C

IPC: H04M9/00 , H04M11/04

CPC classification number: H04M11/04 , H04M9/005

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