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发明名称
Pit prop
摘要
申请公布号
GB900592(A)
申请公布日期
1962.07.11
申请号
GB19580034136
申请日期
1958.10.24
申请人
HELMUT HEESE
发明人
分类号
E21D15/15;E21D15/28;E21D15/58
主分类号
E21D15/15
代理机构
代理人
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