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摘要
申请公布号
US2791847(A)
申请公布日期
1957.05.14
申请号
US19530355550
申请日期
1953.05.18
申请人
HAGMAN ERNEST F
发明人
HAGMAN ERNEST F.
分类号
B42D9/04
主分类号
B42D9/04
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