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经营范围
发明名称
Earth boring apparatus
摘要
申请公布号
US1945258(A)
申请公布日期
1934.01.30
申请号
US19310563050
申请日期
1931.09.16
申请人
CHICAGO PNEUMATIC TOOL COMPANY
发明人
COLLINS ANTHONY H.
分类号
E21B10/08;E21B10/18
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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