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发明名称
VERTICAL POSITION REGULATOR FOR TURNING GEAR OF EARTH DRILL
摘要
申请公布号
JPH04327691(A)
申请公布日期
1992.11.17
申请号
JP19910119065
申请日期
1991.04.24
申请人
SUMITOMO CONSTR MACH CO LTD
发明人
OHASHI HIROSHI
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
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地址
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