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发明名称
Dispositif d'obturation pour le tube de production dans les sondes à pétroles
摘要
申请公布号
FR752471(A)
申请公布日期
1933.09.23
申请号
FRD752471
申请日期
1933.03.15
申请人
NAAMLOOZE VENNOOTSCHAP DE BATAAFSCHE PETROLEUM MAATSCHAPPIJ
发明人
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
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