Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"EARGLE MARVIN H" Page 1

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发明授权
Multichannel intercom system with common signaling channel 失效
Title translation: 具有公共信令信道的多信道对讲系统

公开(公告)号：US3342944A

公开(公告)日：1967-09-19

申请号：US36344964

申请日：1964-04-29

Applicant: BELL TELEPHONE LABOR INC

Inventor： BARBATO ROBERT E , EARGLE MARVIN H , MCEOWEN JAMES R , TRENT DALE W , WELLS GEORGE W

IPC: H04M9/00

CPC classification number: H04M9/005 , H04M9/001

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