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发明名称
NEDSENKBART TESTVENTILTRE.
摘要
申请公布号
NO165258(B)
申请公布日期
1990.10.08
申请号
NO19850002441
申请日期
1985.06.17
申请人
OTIS ENG CO
发明人
SCHWENDEMANN KENNETH L
分类号
E21B;E21B34/04;(IPC1-7):E21B34/04
主分类号
E21B
代理机构
代理人
主权项
地址
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