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发明名称
Tiefbohrvorrichtung mit Abdichtmitteln, einem auf der Verrohrung befestigten Absperrkopf und relativ dazu frei beweglichem Bohrgestaenge
摘要
申请公布号
DE503983(C)
申请公布日期
1930.07.31
申请号
DE1926B123792D
申请日期
1926.01.28
申请人
ARTHUR T. BEAZLEY;NICHOLAS O. WATSON
发明人
分类号
E21B33/068
主分类号
E21B33/068
代理机构
代理人
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地址
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