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发明名称
Drilling mechanism
摘要
申请公布号
US1933589(A)
申请公布日期
1933.11.07
申请号
US19280255754
申请日期
1928.02.20
申请人
SULLIVAN MACHINERY COMPANY
发明人
HOLMES MORRIS P.
分类号
E21C25/66
主分类号
E21C25/66
代理机构
代理人
主权项
地址
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