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发明名称
CASING FOR BORING ABOVE WATER
摘要
申请公布号
JPS5418402(A)
申请公布日期
1979.02.10
申请号
JP19770083140
申请日期
1977.07.12
申请人
CHUO KAIHATSU
发明人
INOUE HIROSHI;SEKO RIYUUZOU
分类号
E21B7/124;E21B7/12;E21B7/136
主分类号
E21B7/124
代理机构
代理人
主权项
地址
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