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经营范围
发明名称
LINE LOCKOUT CIRCUIT
摘要
申请公布号
US3705959(A)
申请公布日期
1972.12.12
申请号
USD3705959
申请日期
1971.05.17
申请人
BELL TELEPHONE LAB. INC.
发明人
RICHARD MAURICE SWANSON
分类号
H04Q3/00;(IPC1-7):H04M3/18
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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