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摘要
申请公布号
US2156980(A)
申请公布日期
1939.05.02
申请号
US19380203906
申请日期
1938.04.23
申请人
GRONINGER HOLMES B
发明人
GRONINGER HOLMES B.
分类号
B22D7/10
主分类号
B22D7/10
代理机构
代理人
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