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发明名称
DRILLING MACHINE FOR USE IN SMALL TUNNELS
摘要
申请公布号
US3490546(A)
申请公布日期
1970.01.20
申请号
USD3490546
申请日期
1968.06.04
申请人
JAMES S. ROBBINS & ASSOCIATES INC.
发明人
JOHN S. HATTRUP;LELAND B. POAGE;HAROLD T. KLEIN
分类号
E21B7/02;(IPC1-7):E21C11/02;E21C1/04
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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