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发明名称
METHOD OF EXCAVATING PIT BY SPIRAL RING CUTTING WITH CENTRAL PILLAR LEFT
摘要
申请公布号
JPS5559297(A)
申请公布日期
1980.05.02
申请号
JP19780131125
申请日期
1978.10.25
申请人
DOWA MINING CO;DOWA KOUEI KK
发明人
MORITA IKUO;TAKEDA MAMORU;RAKUISHI MASANORI
分类号
E21D3/00
主分类号
E21D3/00
代理机构
代理人
主权项
地址
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