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经营范围
发明名称
METHOD OF PREVENTION CONSTRUCTION OF CRUMBLING IN WATER QUALITY FALLINGGOFF AND CRUMBLING SOIL IN BORING* ETC* AND STAGE LOWERING CONSTRUCTION OF CASING
摘要
申请公布号
JPS5380301(A)
申请公布日期
1978.07.15
申请号
JP19760157998
申请日期
1976.12.27
申请人
DOI HIROSHI
发明人
DOI HIROSHI
分类号
E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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