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发明名称
Method and machine for making tapered tubes
摘要
申请公布号
US2029552(A)
申请公布日期
1936.02.04
申请号
US19330693112
申请日期
1933.10.11
申请人
BARNHART GEORGE E
发明人
BARNHART GEORGE E.
分类号
B21C37/18
主分类号
B21C37/18
代理机构
代理人
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