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发明名称
Manufacture of hollow metal bars
摘要
申请公布号
US1857620(A)
申请公布日期
1932.05.10
申请号
US19270211710
申请日期
1927.08.09
申请人
MCCLEANE BROWN
发明人
BROWN MCCLEANE
分类号
B21C37/14
主分类号
B21C37/14
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