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发明名称
MINERAL CUTTING TOOLS
摘要
申请公布号
GB8625936(D0)
申请公布日期
1986.12.03
申请号
GB19860025936
申请日期
1986.10.30
申请人
SPENCER TODWICK LTD
发明人
分类号
E21C35/19;E21C35/197
主分类号
E21C35/19
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代理人
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