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发明名称
GEWINDESCHUTZ
摘要
申请公布号
DE3149912(A1)
申请公布日期
1982.09.09
申请号
DE19813149912
申请日期
1981.12.11
申请人
SUPERIOR CASING CREWS,INC.
发明人
WILLI CLARK,JIM
分类号
E21B17/00;E21B19/15;(IPC1-7):E21B17/10
主分类号
E21B17/00
代理机构
代理人
主权项
地址
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