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摘要
申请公布号
US2231813(A)
申请公布日期
1941.02.11
申请号
US19390274612
申请日期
1939.05.19
申请人
MCDONALD LOUIS N
发明人
MCDONALD LOUIS N.
分类号
B22D7/10
主分类号
B22D7/10
代理机构
代理人
主权项
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