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发明名称
ROCK EXCAVATOR
摘要
申请公布号
JPH01268982(A)
申请公布日期
1989.10.26
申请号
JP19880096439
申请日期
1988.04.19
申请人
FUJII KATSUTOSHI
发明人
FUJII KATSUTOSHI
分类号
E21B7/00;E21B21/00
主分类号
E21B7/00
代理机构
代理人
主权项
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