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发明名称
SURFACE LAYER CASING DEVICE IN CASE OF EXCAVATION OF HOLE FOR STUD
摘要
申请公布号
JPH04185889(A)
申请公布日期
1992.07.02
申请号
JP19900313260
申请日期
1990.11.19
申请人
MITANI SEKISAN CO LTD
发明人
WATABE CHIKAO
分类号
E21B7/20;E02D13/04;E02D27/12;E02D29/045;E21D13/00
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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