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发明名称
EXCAVATION-DIAMETER VARIABLE TYPE PIT EXCAVATING BIT
摘要
申请公布号
JPS58123994(A)
申请公布日期
1983.07.23
申请号
JP19820006083
申请日期
1982.01.20
申请人
HITACHI KENKI KK
发明人
WADA MASAMI;ISHIKAWA YASUAKI;IZUMIYAMA HATSUTAROU
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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