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经营范围
发明名称
Earth boring machine
摘要
申请公布号
US1848351(A)
申请公布日期
1932.03.08
申请号
US19240737489
申请日期
1924.09.13
申请人
OIL WELL SUPPLY COMPANY;WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY
发明人
KEIM LESTER H.
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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