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发明名称
Telephone ear piece
摘要
申请公布号
US2778889(A)
申请公布日期
1957.01.22
申请号
US19530362699
申请日期
1953.06.19
申请人
ERICH HAUSDORF
发明人
HAUSDORF ERICH
分类号
H04M1/03
主分类号
H04M1/03
代理机构
代理人
主权项
地址
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