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发明名称
Hydraulisch betaetigte Ventilvorrichtung fuer ziehbare Innenkernrohre
摘要
申请公布号
DE1256602(B)
申请公布日期
1967.12.21
申请号
DE1965L052235
申请日期
1965.11.26
申请人
E. J. LONGYEAR COMPANY
发明人
KARICH JOHN;PICKARD ALBERT F.
分类号
E21B25/02
主分类号
E21B25/02
代理机构
代理人
主权项
地址
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