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发明名称
APPARATUS FOR EXPANDING HOLES IN EARTH BY ROLLING
摘要
申请公布号
SU717235(A1)
申请公布日期
1980.02.25
申请号
SU19762332891
申请日期
1976.03.04
申请人
INST GORNOGO DELA SO AN SSSR
发明人
SVIRSHCHEVSKIJ VALENTIN K,SU
分类号
E02F5/18;(IPC1-7):E02F5/18
主分类号
E02F5/18
代理机构
代理人
主权项
地址
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