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发明名称
Doppelstrang-Verrohrungskopf
摘要
申请公布号
DE1158918(B)
申请公布日期
1963.12.12
申请号
DE1956B039551
申请日期
1956.03.17
申请人
GEORGE AARON BUTLER
发明人
WALLACE JAMES LEE;EICHENBERG ROBERT
分类号
E21B34/02
主分类号
E21B34/02
代理机构
代理人
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地址
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