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发明名称
EXCAVATING METHOD AND APPARATUS
摘要
申请公布号
CA896403(A)
申请公布日期
1972.03.28
申请号
CAD896403
申请日期
申请人
SUN OIL COMPANY (DELAWARE)
发明人
PRESTON E. CHANEY
分类号
E02F3/18;E21C25/60;(IPC1-7):E02F3/18
主分类号
E02F3/18
代理机构
代理人
主权项
地址
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