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

1.

发明授权
Two-way trunk circuit 失效
Title translation: 双路TRUNK电路

公开(公告)号：US3491213A

公开(公告)日：1970-01-20

申请号：US3491213D

申请日：1969-04-02

Applicant: BELL TELEPHONE LABOR INC

Inventor： GILBOY LAWRENCE J , HAYES RICHARD L , MASUCCI EUGENE D , PATTERSON JAMES M

IPC: H04M7/10 , H04Q3/00 , H04M3/00

CPC classification number: H04Q3/0004

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