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发明名称
Method and apparatus for making helices without the aid of a core or mandrel
摘要
申请公布号
US2182342(A)
申请公布日期
1939.12.05
申请号
US19390253799
申请日期
1939.01.31
申请人
DIAMOND EXPANSION BOLT COMPANY
发明人
KARITZKY JOHN
分类号
B21F3/02
主分类号
B21F3/02
代理机构
代理人
主权项
地址
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