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经营范围
发明名称
HYDRAULIC SPRING TYPE HOLE BOTTOM STRIKING DEVICE FOR BORING
摘要
申请公布号
JPS5223501(A)
申请公布日期
1977.02.22
申请号
JP19750099929
申请日期
1975.08.18
申请人
KOUKEN SHISUI KOUGIYOU KK
发明人
KUMAMOTO KEIJI
分类号
E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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