Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"LACEY JOSEPH C" Page 1

1.

发明授权
Key telephone system signaling circuit 失效
Title translation: 关键电话系统信令电路

公开(公告)号：US3453396A

公开(公告)日：1969-07-01

申请号：US3453396D

申请日：1966-01-20

Applicant: BELL TELEPHONE LABOR INC

Inventor： LACEY JOSEPH C , MCEOWEN JAMES R

IPC: H04M9/00 , H04M1/21

CPC classification number: H04M9/003

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