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发明名称
BOHRSCHRAEMKOPF
摘要
申请公布号
DE2756446(A1)
申请公布日期
1979.01.25
申请号
DE19772756446
申请日期
1977.12.17
申请人
HALL & PICKLES LTD.
发明人
LINDLEY,ERIC
分类号
E21C35/18;E21C35/183;(IPC1-7):E21D9/08
主分类号
E21C35/18
代理机构
代理人
主权项
地址
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