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发明名称
Enhanced privacy feature for telephone systems
摘要
申请公布号
US5033076(A)
申请公布日期
1991.07.16
申请号
US19900473003
申请日期
1990.01.31
申请人
AT&T BELL LABORATORIES
发明人
JONES, WILLIAM C.;KALBOW, WAYNE R.;LARSEN, ERIC T.;MAZUR, ELIZABETH M.
分类号
H04M1/57;H04M1/663;H04M3/436;H04M3/487;H04Q3/42;H04Q3/70;H04Q3/72
主分类号
H04M1/57
代理机构
代理人
主权项
地址
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