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发明名称
Telephone-instrument signaling
摘要
申请公布号
US1771324(A)
申请公布日期
1930.07.22
申请号
US19290359123
申请日期
1929.04.29
申请人
CONNECTICUT TELEPHONE & ELECTRIC CORPORATION
发明人
CADIEUX JOSEPH O.
分类号
H04M1/02
主分类号
H04M1/02
代理机构
代理人
主权项
地址
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