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发明名称
Drilling mechanism
摘要
申请公布号
US1963039(A)
申请公布日期
1934.06.12
申请号
US19280263402
申请日期
1928.03.21
申请人
GOODMAN MANUFACTURING COMPANY
发明人
VODOZ FREDERICK W.
分类号
E21C25/24
主分类号
E21C25/24
代理机构
代理人
主权项
地址
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