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发明名称
CONTROLLING APERTURE PROFILE FORMED BY A CUTTING HEAD
摘要
申请公布号
GB2039568(A)
申请公布日期
1980.08.13
申请号
GB19790001667
申请日期
1979.01.17
申请人
DOSCO OVERSEAS ENG LTD
发明人
分类号
E21D9/00;E21D9/10;(IPC1-7):E21C35/08
主分类号
E21D9/00
代理机构
代理人
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地址
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