Patent search ap:("INT STANDARD ELECTRIC CORP") AND inv:"GOODWIM WRIGHT ESMOND PHILIP" Page 1

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发明授权
Alternating current telephone signaling system 失效
Title translation: 交流电话信令系统

公开(公告)号：US2593512A

公开(公告)日：1952-04-22

申请号：US75322047

申请日：1947-06-07

Applicant: INT STANDARD ELECTRIC CORP

Inventor： GOODWIM WRIGHT ESMOND PHILIP , JOHN REYNOLDS WILLIAM

IPC: H04Q1/453

CPC classification number: H04Q1/4535

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