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1.发明授权Line circuit for a key telephone system utilizing a single multifunction supervisory relay 失效用于使用单个多功能监控继电器的关键电话系统的线路电路
公开(公告)号：US3436488A
公开(公告)日：1969-04-01
申请号：US3436488D
申请日：1966-03-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： BARBATO ROBERT E , DAVIS DAVID T
CPC classification number: H04M9/006
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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
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