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发明名称
VENTILENHET.
摘要
申请公布号
FI923504(A0)
申请公布日期
1992.08.03
申请号
FI19920003504
申请日期
1992.08.03
申请人
PETROLEO BRASILEIRO S.A.-PETROBRAS
发明人
SILVA PAULO, CESAR AUGUSTO;MENDONCA DA SILVA, JOSE EDUARDO
分类号
E21B33/035;E21B34/04;(IPC1-7):E21B/
主分类号
E21B33/035
代理机构
代理人
主权项
地址
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