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发明名称
FERRAMENTA DE POCO PARA PROTEGER O FURO DE UMA CABECA DE POCO
摘要
申请公布号
BR9201304(A)
申请公布日期
1992.12.01
申请号
BR1992PI01304
申请日期
1992.04.10
申请人
FMC CORPORATION
发明人
BASHIR M. KOLEILAT
分类号
E21B17/10;E21B33/04;(IPC1-7):E21B33/02
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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