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发明名称
Means for altering telephone operation
摘要
申请公布号
US3033941(A)
申请公布日期
1962.05.08
申请号
US19580748259
申请日期
1958.07.14
申请人
BELL ROBERT R;FRIEND CARL O
发明人
BELL ROBERT R.;FRIEND CARL O.
分类号
H04M1/663
主分类号
H04M1/663
代理机构
代理人
主权项
地址
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