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发明名称
Percussive well drilling apparatus
摘要
申请公布号
US1896105(A)
申请公布日期
1933.02.07
申请号
US19290401446
申请日期
1929.10.22
申请人
SIMMONS RICHARD P
发明人
SIMMONS RICHARD P.
分类号
E21B4/06
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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