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发明名称
GESTAENGEROHR FUER EINEN BOHRSTRANG
摘要
申请公布号
DE4035982(A1)
申请公布日期
1991.07.11
申请号
DE19904035982
申请日期
1990.11.12
申请人
MCKESSICK MCNEELY JUN., BRANCH, BELLAIRE, TEX., US
发明人
MCKESSICK MCNEELY JUN., BRANCH, BELLAIRE, TEX., US
分类号
E21B7/04;E21B17/00;E21B17/16
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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