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发明名称
Anordnung des Rueckschlagventils im Bohrgestaengestrang eines Versenkhammers
摘要
申请公布号
DE1289007(B)
申请公布日期
1969.02.13
申请号
DE1967B095019
申请日期
1967.10.18
申请人
GEBR. BOEHLER & CO AG
发明人
WERNER FOLK,
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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