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经营范围
发明名称
Rock drill
摘要
申请公布号
US2046135(A)
申请公布日期
1936.06.30
申请号
US19340738921
申请日期
1934.08.08
申请人
INGERSOLL-RAND COMPANY
发明人
SMITH WILLIAM A.
分类号
E21B1/30
主分类号
E21B1/30
代理机构
代理人
主权项
地址
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