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发明名称
TRENCHING DEVICES
摘要
申请公布号
US3606471(A)
申请公布日期
1971.09.20
申请号
USD3606471
申请日期
1969.03.25
申请人
JETCO INC.
发明人
CLIFFORD J. EVANS
分类号
E02F3/24;E02F9/28;(IPC1-7):E21C37/18
主分类号
E02F3/24
代理机构
代理人
主权项
地址
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