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发明名称
HOLE EXPANDER
摘要
申请公布号
JPS5589594(A)
申请公布日期
1980.07.07
申请号
JP19780164949
申请日期
1978.12.26
申请人
TONE BORING CO
发明人
KAWASAKI HIROYUKI;HAMAMURA HIROYUKI
分类号
E21B7/28;E21B10/32;E21B21/00
主分类号
E21B7/28
代理机构
代理人
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地址
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