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发明名称
SPUELUNGSMITTEL FUER DATENUEBERTRAGUNG.
摘要
申请公布号
DE3678502(D1)
申请公布日期
1991.05.08
申请号
DE19863678502
申请日期
1986.01.15
申请人
BIRDWELL, J.C., HOUSTON, TEX., US
发明人
BIRDWELL, J.C., HOUSTON, TEX., US
分类号
E21B47/12;F04B49/00;(IPC1-7):E21B47/12
主分类号
E21B47/12
代理机构
代理人
主权项
地址
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