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发明名称
ENLARGEMENT HEAD FOR EXCAVATION
摘要
申请公布号
JPH116381(A)
申请公布日期
1999.01.12
申请号
JP19970159597
申请日期
1997.06.17
申请人
ASAHI CHEM IND CO LTD;SANWA KIZAI CO LTD
发明人
SHIGEMATSU HIDEKAZU;YAMAZAKI KAZUO
分类号
E21B10/32;(IPC1-7):E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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