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发明名称
Telephone supporting index device
摘要
申请公布号
US2968110(A)
申请公布日期
1961.01.17
申请号
US19590835896
申请日期
1959.08.25
申请人
QUARNSTROM JOHN E
发明人
QUARNSTROM JOHN E.
分类号
H04M1/21
主分类号
H04M1/21
代理机构
代理人
主权项
地址
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