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摘要
申请公布号
US1918103(A)
申请公布日期
1933.07.11
申请号
US19290369026
申请日期
1929.06.07
申请人
HOLLINGSHEAD EVERETT H
发明人
HOLLINGSHEAD EVERETT H.
分类号
E01C23/24
主分类号
E01C23/24
代理机构
代理人
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