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发明名称
Apparatus for opening the bores of drill steels
摘要
申请公布号
US1797018(A)
申请公布日期
1931.03.17
申请号
US19280281905
申请日期
1928.05.31
申请人
GARDNER-DENVER COMPANY
发明人
PEARSON GUSTAV C.
分类号
B21K5/06
主分类号
B21K5/06
代理机构
代理人
主权项
地址
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