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发明名称
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摘要
申请公布号
US1921731(A)
申请公布日期
1933.08.08
申请号
US19310510922
申请日期
1931.01.24
申请人
CHARMAN
发明人
CHARMAN WALTER M.;HEIGHTS CLEVELAND;DARLINGTON HARRY J.
分类号
B22D7/10
主分类号
B22D7/10
代理机构
代理人
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