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发明名称
Rock drill
摘要
申请公布号
US2951467(A)
申请公布日期
1960.09.06
申请号
US19580772297
申请日期
1958.11.06
申请人
INGERSOLL-RAND COMPANY
发明人
MORRISON WILLIAM A.
分类号
E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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