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发明名称
Hydraulischer Ausgleichsuebergang fuer Bohrgestaenge
摘要
申请公布号
DE1233344(B)
申请公布日期
1967.02.02
申请号
DE196500J8279
申请日期
1965.06.03
申请人
JOY MANUFACTURING COMPANY
发明人
CRICKMER CHARLES DROVIL
分类号
E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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