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1.发明授权No-test or busy verification in a private branch exchange telephone system 失效在私人分支机构交换电话系统中进行无测试或繁忙的验证
公开(公告)号：US3410960A
公开(公告)日：1968-11-12
申请号：US43818265
申请日：1965-03-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： ERWIN EDSON L , GERBORE ALEXANDER E , HOBBS GERALD C , WALSH HENRY J
IPC: H04Q3/54
CPC classification number: H04Q3/54
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