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发明名称
Method of making columns and the like
摘要
申请公布号
US1934822(A)
申请公布日期
1933.11.14
申请号
US19310531358
申请日期
1931.04.20
申请人
SAWYER CLINTON H
发明人
SAWYER CLINTON H.
分类号
B21C37/18
主分类号
B21C37/18
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代理人
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