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摘要
申请公布号
US1918801(A)
申请公布日期
1933.07.18
申请号
US19310570327
申请日期
1931.10.22
申请人
DILG CHARLES H J
发明人
DILG CHARLES H. J.
分类号
H04M1/08
主分类号
H04M1/08
代理机构
代理人
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地址
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