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发明名称
摘要
申请公布号
DE8713000(U1)
申请公布日期
1988.02.11
申请号
DE19870013000U
申请日期
1987.09.26
申请人
SCHWARZ, HILARIUS, 5000 KOELN, DE
发明人
分类号
E21B7/02;(IPC1-7):E21B11/02;E02D5/36;E04D13/00
主分类号
E21B7/02
代理机构
代理人
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地址
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