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发明名称
Rotary drill bit
摘要
申请公布号
US1868074(A)
申请公布日期
1932.07.19
申请号
US19290374748
申请日期
1929.06.29
申请人
REESE ENGINEERING COMPANY LTD.
发明人
REESE JESSE C.
分类号
E21B10/26;E21B10/42;E21B10/44
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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