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摘要
申请公布号
US2615576(A)
申请公布日期
1952.10.28
申请号
US19470780557
申请日期
1947.10.17
申请人
DAHLGREN ETHA A
发明人
DAHLGREN ETHA A.
分类号
B42F9/00
主分类号
B42F9/00
代理机构
代理人
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