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发明名称
Earth drilling
摘要
申请公布号
US1838956(A)
申请公布日期
1931.12.29
申请号
US19240759079
申请日期
1924.12.31
申请人
WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY
发明人
NOTTAGE STANLEY GRIGGS
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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